Main and supporting characters ; : A 24-year-old (later 25-year-old in episode 9) young, multi-talented adventurer. He is a happy-go-lucky and honest person that fights to "protect everyone's smiles". Yusuke helps out at the Pole Pole while staying at the shop, and continuously attempts to master 2000 different skills and talents which he uses to help others. He lost his father, a war photographer, when he was a sixth-grade elementary school student, before losing his mother at the age of 18. He was born in
Hokkaido on March 18, 1975. After putting it on for the first time, the belt fuses with Yusuke. It contains a , which is the belt's power source that allows Yusuke to transform into the warrior Kuuga. : As Kuuga, Yusuke has access to a number of different colored forms, each with their own strengths and weaknesses. He is also able to morph objects into weapons for his various forms. He later gains the ability to temporarily enhance his four main forms into gold-accented forms after getting electric shocks, which Yusuke refers to as the . The police refer to Kuuga as until Yusuke reveals his identity to them and begins officially working with them. : During his fight against the Gurongi Tribe, Yusuke rides the and later police motorcycles provided by the Metro PD. The , a
stag beetle-like entity assisting Kuuga, can attach itself to Yusuke's motorcycles as armor to form the and later the , which can also combine with the energy of his Rising forms to become the . • : Yusuke's incomplete form, also known as , that he is forced to assume whenever he is injured, after which he is unable to transform again for two hours. His finisher in this form is the . The police initially refer to this form as and believe it to be a separate being from Kuuga's other forms until they learn about Kuuga's form-changing powers. • : Yusuke's default form, also known as , that grants superhuman athleticism. His finisher in this form is the . • : An evolution of Mighty Form that that equips Yusuke with the , which increases the power of his Mighty Kick into the . • : A black-colored evolution of Rising Mighty and Yusuke's super form that equips him with a second Mighty Anklet, which increases the power of his Rising Mighty Kick into the . • : An auxiliary form, also known as , that grants superhuman speed. In this form, Yusuke can morph any pole or stick-like object into the staff, which allows him to perform the finisher. • : An evolution of Dragon Form that enhances the Dragon Rod into the double-bladed , which increases the power of Yusuke's Splash Dragon into the . • : An auxiliary form, also known as , that grants superhuman senses. In this form, Yusuke can morph any gun-like object into the , which allows him to perform the finisher. However, he can only use this form for 50 seconds before succumbing to sensory overload and being forced into Growing Form. • : An evolution of Pegasus Form that enhances the Pegasus Bowgun into the rapid-fire , which increases the power of Yusuke's Blast Pegasus into the . He can also use this form 30 seconds longer than Pegasus Form. • : An auxiliary form, also known as , that grants superhuman strength. In this form, Yusuke can morph any pole or stick-like object into the , which allows him to perform the finisher. • : An evolution of Titan Form that enhances the Titan Sword into the longer and broader , which increases the power of Yusuke's Calamity Titan into the finisher. He can also produce a second Rising Titan Sword for dual wielding and to perform the stronger finisher. • : Yusuke's black-colored final form, also known as the , that possesses immense destructive potential. However, he risks losing control in this form, which changes the form's eye color from red to black. • : A gold-colored evolution of Ultimate Form that is exclusively used by Yusuke's
A.R. World counterpart Yusuke Onodera. ; : A 25-year-old (later 26-year-old in episode 15) assistant police inspector of the Security Division of the
Nagano Prefectural PD. He is sent to the Unidentified Life Form Joint Task Force Office, which is set up in the
Metro PD to investigate and counter the Gurongi. Like his father, who died on his tenth birthday, Ichijo is a model policeman who firmly believes in doing the right thing. Though he is very strict with himself, he will do everything he can, even bend police rules, to help Yusuke fight the Gurongi. After the Gurongi were defeated, Ichijo returns to Nagano. He was born in
Nagoya on April 18, 1974. ; : A 23-year-old friend of Yusuke from a university and a graduate student at Johnan University who translates the ancient "Lintonese" transcripts that tell of Kuuga and the Gurongi. At first, she was against helping because she was worried about Yusuke, but now she believes in him fully and works hard to help Yusuke understand his powers by deciphering the writings. She was born in
Gunma Prefecture on October 30, 1976. ; : Yusuke's 22-year-old younger sister who works as a teacher at Wakaba Nursery School. Yusuke occasionally visited her there to entertain the kids. Like Sakurako, she was at first apprehensive about her brother transforming into Kuuga, but she believes in Yusuke and helps out however she can. She was born in Hokkaido on September 4, 1977. ; : A 26-year-old forensic doctor at Kanto Medical University Hospital and a trusted friend of Ichijo from high school, he is the doctor who looks after Yusuke and treats him when he becomes injured, while also researching the effects of Yusuke's fusion with the Arcle. Though he is a light-hearted person, he was very serious and worried when talking about Yusuke's future transformations because of the constant dangers that surrounded the Kuuga legend. He also performs the autopsies of the Gurongi victims to determine the causes of death. ; : A 34-year-old researcher of the
National Research Institute of Police Science, she studies the biology of the Gurongi to develop effective weapons against them. She also assists in the study of Kuuga and the Gouram. Because of the massive amount of work required of her to fight the Gurongi, she was away from home quite often and her child felt lonely and neglected. ; : A 44-year-old former adventurer, he was friends with the father of Yusuke and Minori, who affectionately refer to him as like everyone else. He owns and runs the Pole Pole. He is a goofy, light-hearted character that keeps a scrapbook of all of Kuuga's exploits from the newspaper, though unaware of Yusuke being "ULF 04" and thinks that the name "Kuuga" is some nonsensical word made up by Yusuke. After learning the truth, however, he dons the Kuuga mark on his apron in the series epilogue. He was born on June 9, 1955. ; : Tamasaburo's 17-year-old niece from
Kyoto Prefecture, who helps out at the Pole Pole while aspiring to be an actress. However, since the death of her acting teacher at the hands of Gurongi, Nana has been troubled until Yusuke finally helps her overcome her sadness. ; : A 27-year-old graduate student at Johnan University from France that shares the work office with Sakurako. He researched the broken fragments that later formed into Gouram. He has a crush on Enokida and hoped to help her reconnect with her child. ; : The 57-year-old head of the Security Bureau of the Metro PD and the head of the Unidentified Life Form Joint Task Force Office. ; : A 37-year-old detective of the First Investigation Division of the Metro PD who is also a member of the Unidentified Life Form Joint Task Force Office. ; : A 26-year-old detective of the First Investigation Division of the Metro PD who is also a member of the Unidentified Life Form Joint Task Force Office. ; : A 21-year-old policewoman of the Unidentified Life Form Joint Task Force Office who sends communication from headquarters. ; : The 14-year-old daughter of Professor , and one of Daguva's victims, she was greatly depressed when her father's murder was being overlooked for the Gurongi attacks, taking the findings her father had at their house. But after Yusuke reasons with her, Mika decides to aid in the Gurongi matter as Jean's assistant. However, she is unable to follow and decides to take up playing the flute her father gave her. But while attending the 12th Arikawa Group Flute Competition, a hostage situation by a disgruntled government worker traumatizes Mika as Yusuke tells her not to run from her fear and continue. Three months later, Mika attended a special college. ; : Yusuke's 52-year-old elementary school teacher, he served as an inspiration to Yusuke, and the two of them visit on certain occasions. ; : A 22-year-old young troubled man, he saw the Gurongi as salvation until he was saved by Kuuga. He later researched trying to make a living until he was knocked out by while on his way to a contest.
Gurongi Tribe The is a mysterious ancient civilization whose members can transform into monsters to kill people for their ruthless game, referred to in their language as the . The 200 members of the Gurongi made their rival civilization the , humanity's ancestors before they were defeated and sealed by the original Kuuga, Riku. However, the seal was undone in 2000 with the Gurongi resuming their Gegeru on the human race that are the Linto's descendants to bring about the , when humanity will become as violent as the Gurongi. The Gurongi are classified as , while those that have a human form are labeled . Each of the Gurongi possesses a stylized belt with a . The naming pattern of the Gurongi is "Group·Species·Creature type": the first part denotes their rank, the second part is the personal name, and the third part indicates the
type of animal they resemble. Only 25 out of the 200 Gurongi appeared in the course of the series. In the series, the Gurongi speak in their own
native language (originally created by the producers as a cipher of the Japanese language) which was left purposely unsubtitled during the original broadcast to prevent the audience from learning the series' mysteries and plot twists (as it was referred by them in the early episodes). The Xu Group is the first to play in the Gegeru, then the Me, and finally the Go in the . The Gegeru is overseen by the two La Gurongi, and the winner of the Gerizagibas Gegeru receives the right to challenge their leader, N·Daguva·Zeba, to a duel known as the for the leadership of the Gurongi. The are the judges of the Gegeru and are Daguva's right-hand men. The crafts the artifacts used by the other groups. The contains lower-tier Gurongi under Zu·Zain·Da, most of their kin slaughtered by Daguva as they failed to acquire the right to participate. Those who did qualify are brought into the Gegeru by writing their names on the portable blackboard and using the beads of their bracelets to mark the number of people they have killed. The are middle-tier Gurongi led by Me·Garima·Ba, its members brought into the Gegeru by using the abacus to predict the number of people they are to kill and the period to accomplish that. The are high-tier Gurongi who can transmute their ornaments into weapons like Kuuga displays while in his Dragon, Pegasus, and Titan forms. Unlike the lesser tiers, the Go having La·Doldo·Gu tally their kills for them while creating their rules of conducting their kills. The Go who completes the Gegeru, or the one who can defeat all the Go class Gurongi, earns the right to fight Daguva for control of the entire Gurongi Tribe. Their leader is Go·Gadol·Ba, one of the three strongest Go Gurongi who had modified themselves to alter their forms like Kuuga and Daguva. The lowest were all murdered by Daguva without acquiring the right of the Gegeru. ; : The stag beetle-like lord of the Gurongi and the primary antagonist of the series, called by his kin as the . Sealed away by the previous Kuuga, Riku, Daguva was resurrected in modern times in his , labeled as by the police, slaughtering Riku's sleeping body and the archaeologists who broke the seal. Spending most of the series killing 152 of his kind he deemed unworthy to participate in the Gegeru, Daguva resurfaces in his fully restored . By the time he resurfaces after killing Goma, Daguva assumes the guise of a white-suited young man with an aura whom the police labeled as . After Gadol's death, Daguva begins his endgame with endless heavy rain and initiates a systematic genocide of all people in Japan. He is eventually killed by Yusuke after an epic fight that pushed the other to his limits, Daguva dies from his injuries while mocking Yusuke would become as violent as he is. ; : A
photophobic vampire bat-like Gurongi labeled and , Goma initially murdered a preacher named Father Jose and disguised himself to use a church as a base of operations before Ichijo uncovered the truth and the Gurongi is ultimately forced to retreat. Following Zu being removed from play, wearing a trenchcoat and fedora to protect himself, Goma becomes Balva's underling. But Goma retrieved a discarded piece of Daguva's buckle and had it refined before using it to evolve himself into his to have freedom of movement in daylight. But it also increased Goma's bloodlust as he turns on Balva and intended to kill Daguva to gain his power, driven off by Gadol as the final stages of his evolution take effect. Fully evolved into his armored , Goma nearly kills Kuuga when Daguva finally arrives. Goma runs off to fight Daguva, only to be slaughtered by him with his corpse used to develop the nerve-breaking bullets. Goma's name in Japanese comes from the readings for . ; : The hotheaded
rhinoceros-like the leader of the Xu Group, labeled and , assuming the form of a hulking strongman with a temper. Soon after his group was removed from the Gegeru in favor of the Me Group, Zain starts acting on his own after the Gurongi Tribe's first lair was raided, attacking trucks and impaling drivers with his horn. He overpowered Kuuga in both human and Gurongi forms when intervened as Zain stole his turn. While Zain resumes his attack on large motor vehicles, Yusuke manages to perfect his Mighty Kick to finally kill the Gurongi. ; : A smart
chameleon-like Gurongi, labeled and . Originally , he is promoted between the Gegeru of Unidentified Life Forms #10 and #11, desiring to become a Go and playing a part in murdering Nana's acting teacher. Posing as a man with wild blonde hair, Galme's turn came as he uses his cloaking abilities to hide in high areas, dragging his victims with his tongue to hang them while smashing their faces against a surface, announcing his next location to kill, going for the Komazawa Square and then at the Central Tower, where the police stand by. Learning of a five-minute window, the police attempt to use flash grenades to disrupt Galme's chromatic cellular makeup while learning the reason for the Gurongi attacks. Though the visible Galme outruns the police, he runs into Kuuga as they battle. But once Galme turns invisible to escape, he is killed by Kuuga's Gouram-aided Blast Pegasus. The encounter with Galme, who tends to speak Japanese, together with Ichijo's experience with Balva, leads the police to realize that the Gurongi are capable of speaking their language as well. ; : The
mantis-like leader of the Me Group, labeled and . Garima has a tattoo on her right pointer and thumbnails and a green streak in her hair while in her human form. While Galme begins his Gegeru, Garima receives a double-bladed scythe/lance as the Go arrives and she was on a train at the Ochanomizu Station, marking victims with her scent. Than she tracks down the 288 victims who left the train prior and strikes them down with her weapon, her victims unaware of their death until they look back to face her. When Kuuga attempts to fight her in Titan Form on the Gouram, Garima manages to endure the Try Gouram Attack and escape in the confusion, wounded but able to continue the Gegeru with her scythe-katana. She was about to kill Sakurako when Yusuke arrives at her aid, assuming Rising Titan and running through Garima. ; : A
grasshopper-like Gurongi, labeled and . The first of the Go to appear when he intervenes in Kuuga's fight with Goma before leaving the scene and then formally introducing himself when starts to play. Assuming the form of a young man wearing a red scarf (which pays homage to Kamen Rider 1) and carrying a coin, Badaa rides a motorcycle named the as his weapon that can reach speeds of 400 km per hour. When his turn came, he begins to kill 99 motorcyclists. When the Try Chaser 2000 is damaged, Kuuga is left at a disadvantage as Badaa leaves with a promise to save him in his Gerizagibas Gegeru. By the time Badaa reached 98, he decides to finish off Kuuga. However, after being barraged with bullets, Badaa is driven into a secluded location where Kuuga meets him on the Beat Chaser 2000, outrunning him and assuming Rising Mighty before he fatally knocked Badaa off his motorcycle. ; : The fierce
rhinoceros beetle-like the leader of the Go Group and one of the three strongest Go Gurongi, labeled and . Armed with various weapons similar to Kuuga, he assumes the form of a man in militant garb. As the Go's leader, he intervenes in the fight between and Goma and later comes to Balva's aid against a power-mad Goma when Kuuga arrives to witness him putting the bat-like Gurongi back in his place. With Daguva going to Tokyo soon, he and the other two remaining Go Gurongi undergo the same process as Goma to ready themselves. After his two allies were killed, Gadol is the last of the Gurongi to play. After undergoing training to ready himself, Gadol heads to the police department to find worthy opponents to fight as part of his Gerizagibas Gegeru. When confronted by Kuuga in his default , Gadol reveals his new ability to use the different powers of Kuuga, , , and , before defeating Kuuga at full power in . But due to Ichijo, Gadol's Gerizagibas Gegeru had to be reset as the Gurongi attempts to kill Doldo for failing his part. After Doldo retreats, angry Gadol attempts to kill Ichijo upon being wounded by the officer's nerve-breaking bullets as Yusuke arrives to battle the Gurongi as Kuuga. Once taking their fight to the woods, Kuuga assumes Amazing Mighty and destroys Shocker Form Gadol. ==Episodes==