Characters
Main ; : :A rebellious foot soldier from the villainous army in the sky fortress that arrived 13 years ago, he is a Duster with transformative and regeneration abilities alongside his fellow foot soldiers who vowed to defeat the Dragon Keepers by infiltrating their organization and ranks. He takes on two disguises for most of the series; one is an appearance of an average black haired teenage guy, and the other as Hibiki so he can use his identity to infiltrate their ranks easier. ; : :An inspiring independent Ranger cadet who is aware of the Dragon Keepers' corruption but wishes to fix their system by bringing them back to their original sense of justice. Following an attack to cover D, he swaps places with him after becoming disfigured while D carries on using his identity for most of the series. His current whereabouts remain unknown. ; : :A Junior First-Class ranked Ranger from the Yellow Battalion, who has a mysterious grudge against the Dragon Keepers. She and D made an alliance together to collect their Divine Tools and plans to kill them, though her background and motives remains unknown. Dragon Keepers The Dragon Keepers organization comprises the five "First Class" Dragon Keepers and those under their command. Each Keeper has their own battalion with distinct responsibilities within the organization, and each member has a different rank determined by their respective Keeper. The First Class Keepers also possess the Divine Tools that have the power to permanently kill members of the Villainous Army, although lower-ranking members can be assigned replicas or other weapons with similar power. First Class ; : :The leader of the Dragon Keepers and commander of the Red Battalion. Despite appearing friendly and inspiring, he possesses an extremely violent nature that he will not hesitate to use on those that anger him, including his own subordinates. ; : :The Blue Keeper and commander of the Blue Battalion, and the only member with visible scars on his face. Originally in a gang to raise money for an orphanage, he joined the Rangers after Akabane blackmails him while in jail. He is killed by Peltrola's sneak attack while he is fighting D. ; : :The Yellow Keeper and commander of the Yellow Battalion. He is often seen smiling constantly. ; : :The Green Keeper and commander of the Green Battalion. He is the only member of the team to have his entire face covered and is almost always silent. ; : :The Pink Keeper and commander of the Pink Battalion and Hibiki's older sister. She is obsessed with keeping Hibiki safe. When un-transformed, it is revealed she is crippled after getting caught up in Peltrola's battle and has to rely on a wheelchair. She is struck down by Hwalipon during a war with his monsters. ; : :The original Blue Keeper who stepped down from the role when Shougo Aoshima was chosen, but returned upon the latter's death. ; : :The second Pink Keeper who previously held the rank of Third Class before taking up the mantle of Pink Keeper following Sesera's fall. Red Battalion ; : :The current second-in-command of the Red Battalion who formerly held the position of Third Class. ; : :A former colorless cadet who originally joined to seek revenge on the boss monsters for the death of his brother and to get the truth of why their existence was hidden by the Ranger Academy, feeling betrayed by them in their corruption. He transferred over to the Red Battalion due to his actions in fighting Peltrola in the first year, even though he failed the test; the Rangers were impressed by his skill. ; : :A member of the Red Battalion with the rank of Junior Third Class. In spite of his intimidating lion-like appearance, he shows himself to be quite compassionate and considerate of his fellow cadets. ; : :The first former second-in-command of the Red Battalion with the rank of Junior First Class. Despite appearing polite and civil, he has ambitions of replacing Akabane as Red Keeper. After Akabane gets outsmarted by D at one point, Jin loses faith in his leader and demands that he hand over the role of Red Keeper to him, only to get beaten to death by his former idol. ; : :The second second-in-command of the Red Battalion after Jin's death to serve under Akabane. Unlike Jin, Dairyu is far more reserved and withdrawn. During a meeting between the Dragon Keepers and their second-in-commands, Dairyu accidentally spills tea on Akabane after tripping on himself. Akabane then promptly beats him to death like he did his previous second-in-command. ; : :A member of the Red Battalion with the rank of Second Class, serving as a rival to Tokita. He is killed by monsters when investigating a zoo. ; : :The third second-in-command of the Red Battalion after Dairyu's death to serve under Akabane. At some point, he is murdered by the Executive Hwailipon, who then wears his skin to infiltrate the Dragon Keepers and keep an eye on their activities. Blue Battalion ; : :The second-in-command of the Blue Battalion, first serving under Keisuke Souma until he stepped down and then serving Shougo Aoshima when he took over, forming a deep bond with the latter. Formerly cheerful and light-hearted, she becomes cold-hearted and obsessed with getting revenge for Aoshima's death, treating Souma with indifference when he takes over again. ; : :A former colorless cadet who gets inducted into the Blue Battalion for his actions against Peltrola despite failing the entrance test. He once shared the dream of becoming Rangers together with Koguma, and continues on for his sake after the latter falls into a coma due to his injuries in fighting Peltrola. He is very protective of his younger siblings who look up to him and convinces the Fighters in the floating fortress to aid him fighting the Death Messiah. ; : :A lower-rank member of the Blue Battalion. ; : :A second class member of the Blue Battalion under Aizome who also looked up to Aoshima and is devastated by his death. ; : :A member of the Blue Battalion with the rank of Junior Third Class. Known for his emotional instability, he is shown having a severe weakness complex and cares too much about what others think of him. ; : :A lower class member of the Blue Battalion known for his recklessness. Green Battalion ; : :The second-in-command of the Green Battalion under Chidori. Hisui lost her family to the monster invaders as a child and harbors a great deal of vitriol against them. It was only after climbing the ranks of the Rangers that she became more open-minded and chose to fight for justice instead of revenge. Similar to Chidori, she is aware of the corruption in the Ranger organization. ; : :A former colorless cadet who passes the entrance test and joins the Green Battalion. She is secretly a member of the Invader Rights Association who infiltrated the Rangers under her father's orders. However, after discovering the group's true plans, she breaks away and sides fully with the Rangers. ; : :The original second-in-command of the Green Battalion under Chidori. Kanade used to be rivals with Hisui, often sparring whenever they could, but they held respect for one another. Kanade was killed by her fellow Green Battalion member Kyosuke Wakaba, who betrayed them and took the side of the Executive Magatia. Yellow Battalion ; : :The second-in-command of the Yellow Battalion under Shinya Kiritani. She is known for her analytical mind and genius, helping her leader invent new things. ; : :A former colorless cadet who passes the entrance exam. She initially joins the Blue Battalion before transferring to the Yellow Battalion after discovering her smarts are better suited for science and analyzation. ; : :A member of the Yellow Battalion under Shinya Kiritani with the rank of Third Class. Known for his curiosity, he ends up getting into trouble with the Invader Rights Association where Shinya ends up sacrificing him to defeat an enemy he gets entangled with. Pink Battalion ; : :The second-in-command of the Pink Battalion under Sesera until her fall during the fight with Hwalipon, now serving under Noa Hagino after she takes up the mantle. In spite of his Bara-like appearance and imposing visage, he is actually quite gentlemanly, except for battle where he can cut loose. He is devastated after Seresa's fall. Colorless Rangers The "Colorless" refer to the lowest-ranking members of the Keeper hierarchy, and are often looked down upon by those higher up the ranks. ; : :The oldest of the colorless cadets who once held the Keepers in high regards. He is killed by Peltrola during the monster's reveal in the final exams to become Rangers, sacrificing his life to ensure his friends succeed. ; : :The only female left of the colorless cadets. Even after failing the first test, she remains where she is in an attempt to become a full cadet eventually. She and Shippou become close after the first year. ; : :A member of the colorless cadets who originally joined in order to become popular with the ladies. After the first year, he becomes close with all his fellow cadets and now seeks to fight for real justice. ; : :The strongest physically of the colorless cadets. Though he passes his test, he chooses to stay behind to help his fellow low level cadets, becoming particularly close with Akebayashi in the process. ; : :The shortest of the colorless cadets who is childhood friends with Urabe, both with dreams of joining the Keepers. He is the first to discover D's identity when he is in disguise as Hibiki, the Duster having trusted him enough to reveal his secret. He is nearly killed by Petrola when the monster reveals himself in the Blue Garrison, but survives and is left in a coma for a time; reawakening after the fall of the Invader Rights Association. Others ; : :The mascot of the Dragon Keepers. ; : :A former member of the Green Battalion, who led Ouroboros with the Executive Magatia. He betrayed and murdered the second-in-command Kanade Tokiwa out of jealousy for her Divine Artifact and out of disillusionment with the world around him, preferring to live in the fantasy Magatia gave him. He is ultimately killed by Hisui, avenging Kanade and the lives of the other Green Battalion he murdered. ; : :A former soldier who fought in war that became disillusioned with the undeserved deaths of children, swayed into joining Magatia under the false promise of creating a more perfect world without strife and made to operate in the abandoned school as a teacher. ; : :A young teen who was spirited away and killed by Magatia to be made into his human vessel for the purpose of hiding his presence in the abandoned school. ; : :A detective of the Metropolitan Police Department and the older brother of Yuu who seeks to learn the truth of his younger brother's disappearance, inadvertently getting involved in the fight against the boss monsters in the process. ; : :A detective from the Metropolitan Police Department. He and Nishiki are investigating the spirited away cases of young students in the Amanogawa City. ; : :The chairman of Invader Rights Association board and the father of Angel Usukubo. ; : :A former Executive who was banished for being too passive. Unlike many of her peers, she did not see the Fighters as pawns and actually sought coexistence with humans, becoming the first boss monster to gain the power to shift into a human form instead of stealing a human's body. At some point after her banishment, she met and fell in love with Yakushi while she was in her human form. Through their union, she gave birth to their daughter Angel. She was later killed, leaving both her lover and daughter distraught. ; : :A journalist and a board member of the Invader Rights Association. She injects herself with the DNA of the boss monster Andrega, gaining his powers and part of his appearance. She is killed during the raid on the association's headquarters. ; : :A devout monster supporter and one of the board members of the Invader Rights Association who was once a bullied high school student. He injects himself with the DNA of Magatia, allowing the boss monster to resurrect through him as a vessel only to end up losing once more to the Dragon Keepers. ; : :The owner of the Amanogawa Central Wildlife Park and one of the board members of the Invader Rights Association. She injects herself with the DNA of the boss monster Todomask, becoming his vessel and allowing him to come back in her body only for both to be killed by Green Keeper, who had killed Todomask prior. ; : :A former Second Class cadet for the Yellow Battalion who retired and joined the Invader Rights Association as a board member. He is killed by Red Keeper when he tried infiltrate their headquarters. ; : :A former Executive, once named Chakobul, who was exiled from the Villainous army for being "different". After meeting up with fellow exiled Executive Ruuna, both became lovers and even gained the power to combine. Unlike many of his fellow boss monsters, he never saw the footsoldiers as cannon fodder and even felt sympathy towards them. Now he and Ruuna work to stand against both the other Executives and other corrupt individuals in the world. ; : :A former Executive, once named Yakekokab, who was exiled from the Villainous army for being "different". After meeting up with fellow exiled Executive Kiisu, both became lovers and even gained the power to combine. Unlike many of her fellow boss monsters, she never saw the footsoldiers as cannon fodder and even felt sympathy towards them. Now she and Kiisu work to stand against both the other Executives and other corrupt individuals in the world. Villainous Army Executives ; : :A surviving Executive of the Villainous Army who resides in the Blue Garrison yet eventually escapes with the aid of XX who had been serving him in secret. He kills the Blue Keeper while the latter was preoccupied in a fight against D and now seeks revenge on the Dragon Keepers. ; : :A surviving Executive of the Villainous Army who lives in disguise while working with the Invader Rights Association, being well known by the world for his livestreams, where he would call out the truth behind the Rangers. ; : :A surviving Executive of the Villainous Army who resides in a school by trapping it in a loop. After his loop is thwarted through the efforts of D, he killed by Greek Keeper. He is then revived by the Invader Rights Association who acquired his DNA which member Juji injects himself with, becoming a host for the Executive. ; : :A deceased Executive, killed by Blue Keeper in the past, but his DNA was seized by the Invader Rights Association in an attempt to revive him when member Kaede Ukyo injects it into herself. ; : :A deceased Executive, killed by Green Keeper in the past, but his DNA was acquired by the Invader Rights Association. He is revived by member Inko Tachibana who injects his DNA into herself, becoming his host, only to be killed by Green Keeper once more. Dusters ; : :A loyal footsoldier who stayed in the fortress, submitting to the Dragon Keepers. He was the de facto representative and lead of the footsoldiers and would take the lead during the Sunday Showdowns, apologizing for his comrades whenever they would act up against the Dragon Keepers in order to save their skins. He often appraised the fake boss monsters and would lead the charge during each Sunday. In the end, he is inspired by D and Urabe to stand up to the Executives for their oppressions. ; : :A loyal footsoldier who stayed in the fortress, submitting to the Dragon Keepers. After spending so much time in the fortress being forced to serve the Dragon Keepers, he eventually is inspired by D and Urabe to stand up to the Executives for their oppressions. ; : :A loyal footsoldier who stayed in the fortress, submitting to the Dragon Keepers. After spending so much time in the fortress being forced to serve the Dragon Keepers, he eventually is inspired by D and Urabe to stand up to the Executives for their oppressions. ; : :A loyal footsoldier who stayed in the fortress, submitting to the Dragon Keepers. He was D's first true friend and leaves the fortress to find him when he leaves to infiltrate the Dragon Keepers, only to end up being caught by them and executed by Red Keeper. His death heavily affects D. ; : :A loyal footsoldier who stayed in the fortress, submitting to the Dragon Keepers. After spending so much time in the fortress being forced to serve the Dragon Keepers, he eventually is inspired by D and Urabe to stand up to the Executives for their oppressions. ; : :A loyal footsoldier who stayed in the fortress, submitting to the Dragon Keepers. After spending so much time in the fortress being forced to serve the Dragon Keepers, he eventually is inspired by D and Urabe to stand up to the Executives for their oppressions. ; : :A loyal footsoldier who stayed in the fortress, submitting to the Dragon Keepers. She is one of the only known female footsoldiers. After spending so much time in the fortress being forced to serve the Dragon Keepers, she eventually is inspired by D and Urabe to stand up to the Executives for their oppressions. ; : :A loyal footsoldier who stayed in the fortress, submitting to the Dragon Keepers. After spending so much time in the fortress being forced to serve the Dragon Keepers, he eventually is inspired by D and Urabe to stand up to the Executives for their oppressions. ; : :A loyal footsoldier who stayed in the fortress, submitting to the Dragon Keepers. He was often made to play the fake boss monsters for the Sunday Showdown due to his height and strength. After spending so much time in the fortress being forced to serve the Dragon Keepers, he eventually is inspired by D and Urabe to stand up to the Executives for their oppressions. ; : :A stray female footsoldier who left the fortress in search of any surviving boss monsters and resides in Hibiki's room who befriends D. == Production ==
Media
Manga Go! Go! Loser Ranger! is written and illustrated by
Negi Haruba. The series began serialization in
Kodansha's
Weekly Shōnen Magazine in the 10th issue published on February 3, 2021. Kodansha has collected its chapters into individual volumes. The first volume was released on April 16, 2021. As of February 17, 2026, twenty-one volumes have been released. In November 2021, during their panel at
Anime NYC,
Kodansha USA announced their license to the series and would release it in both print and digital. On February 19, 2025, it was announced the manga was going on a two-issue hiatus due to Haruba's health issues. It went on another hiatus on May 7 of the same year due to the same reason.
Anime An
anime television series adaptation was announced on December 6, 2022. It was produced by
Yostar Pictures and directed by
Keiichi Sato, with scripts written by Keiichirō Ōchi, and character designs handled by Kahoko Koseki, with Kenji Hayama serving as animation supervisor. The series aired from April 7 to June 30, 2024, on
TBS and its affiliates. The opening theme song is , performed by
Tatsuya Kitani, The series is streaming worldwide on
Disney+, and on
Hulu in the United States, with the English dub premiered on Hulu on June 12, 2024. Following the final episode of the first season, a second season was announced, which aired from April 13 to June 29, 2025, on the
Agaru Anime programming block on all
JNN affiliates, including
CBC and TBS. The opening theme song is , performed by
Orange Range, while the ending theme song is , performed by Fukurow note.
Episodes Season 1 (2024) Season 2 (2025) Stage play On July 1, 2024, a stage play was announced. It ran at Theatre G-Rosso in Tokyo from September 11 to September 16, 2024. == Reception ==