Emperor Cain '''''' is the ruler of Solaris. He was created along with the Gazel Ministry and Miang to serve as part of the resurrection of Deus. When Abel and Elly fight against Cain's plans for resurrecting Deus, Cain plotted the death of Abel, an allusion to
Original sin. Although he is supposed to aid Deus as a leader of Solaris, he actually believes in improving humanity's lives. He becomes at odds with the Gazel Ministry when they want to use the Gaetia Key, and Ramsus eventually assassinates him under Krelian's orders.
Margie Fatima '
, nicknamed ', is the current Holy Mother of Nisan, a position Sophia once held. She is both Bart's first cousin and his fiancée, as they are the only living members of the Fatima royal family. She is calm and endearing despite her duties.
Hammer '''''' is a rat demi-human who meets Fei in Kislev's D Block Prison. During the Kislev scenario, Hammer presents himself as a shifty, though reliable mechanic, item seller, and intelligence gatherer. He is seemingly well known throughout Kislev, as he is able to freely roam on his own despite being a prisoner. Hammer tags along with the group as they steal the Goliath plane, but is separated from them following an encounter with Grahf. He reappears later on after apparently encountering Krelian and being given a new cyborg body. He explains to the party he had originally been sent to spy on them, but refused to cooperate. He then asks the party to destroy him, as he has only a limited amount of control over his new body and he does not want to be Krelian's puppet. He then sabotages his gear while the party takes him down.
The Elements An elite four-member team of Solaris' military, with each representing one of four elements; earth, water, wind, fire. In the past, the group was composed of Ramsus, Citan, Jesse and Sigurd; in the present, it is composed of four young women, each named after
an order of angels. They currently work directly under Ramsus, and encounter the party several times. In the final encounter with the Elements, they combine their four gears into a super-gear. • '''''', the Element of Earth, is a vicious, domineering woman who is the team's leader; she is the only member with a surname. She became the soldier she is today after becoming the sole survivor of the events at Elru, which was destroyed by war, and Id in particular. She has numerous altercations with Elly in particular, mocking her for her noble origins. Despite being the Element of Earth, Dominia infuses all of the four elements into her blade. She is the only Element to do this, as the others exclusively use their own element. She pilots a sword-wielding gear called Bladegash. •
Kelvena () is the Element of Water. Unlike Domina, she is calm and cool, even apologizing to Elly for Dominia's harshness despite being on opposing sides. Kelvena pilots an aquatic gear called Marinebasher. Her character portraits often show her with her eyes closed, implying she may be blind. In reality, her innate ether power is so great that she must exert considerable concentration to keep it under control. •
Tolone () is the Element of Wind. She is a cyborg, as she makes reference to her "positronic photon brain", and is serious and humorless. She pilots a bird-like gear called Skyghene. • '''''' is the Element of Fire. She is a foil to Dominia and Tolone's rigidity, as she is unintelligent. She pilots a gear called Grandgrowl, which resembles a lion.
Wave Existence The ''''
exists within the Zohar, and was present during the events on the Eldridge. Deus used the Zohar as an energy source; while attempting to explore infinite energy phenomena, the Zohar tapped into a higher dimension and pulled the Existence to this dimension, becoming a source of infinite energy for Deus. The Existence is the source of the higher dimension, of which a small portion spilled into this dimension, making the Existence the true God of the Xenogears'' universe. It seeks to escape from the Zohar and Deus' control and return to its own dimension. The Wave Existence made contact with Abel, Fei's ancestor, aboard the Eldridge, allowing Abel to safely land on the planet with Deus. It also created Elly as a companion for Abel and gave them the power to be reincarnated throughout history to defeat Deus. It is ultimately freed after Fei defeats Deus.
Wiseman '''''' appears throughout the game to aid Fei, and is secretly a personality inside of his father, , who formed inside of him when Grahf entered his body after he defeated him ten years prior to the game's events. Wiseman's appearance inside Khan occurred to balance out Grahf's destructive persona. Wiseman later brought Fei to Lahan to hide him from Grahf.
Queen Zephyr '''''' is the ruler of Shevat, who became ruler after the rest of the royal family was killed during the rebellion against Solaris five hundred years prior to the game's events. She relies on Wiseman to keep her informed of events outside Shevat. Her top advisors are Gurus , and . ==Reception==