We could use some help on this page. Hit the edit button to get started.
Aside from being member of team Chu, Zeru's origins are completely unknown.
Zeru appears as a young man of moderate height and athletic build. He has pale skin and spiky blond hair. He has narrow eyes and no facial hair. Despite being a Demon, the only feature that gives him away as not human are his pointed ears.
Zeru has a confrontational attitude. He met with team Urameshi before he had to fight them in the tournament and attempted to intimidate them. Once in the ring against Hiei he was ruthless and attempted to kill the latter with extreme prejudice.
Rinku - The only relationship Zeru was really shown to have, although he is a part of team Chu and hence, is familiar with the entire team.
Zeru followed after his partner Rinku after the latter entered the room of team Urameshi uninvited. Zeru attempted to intimidate his competition and cut a nearby glass with heat alone. Hiei however was not impressed and pointed out a minor flaw in the technique. The two agreed to settle their differences in the tournament.
Rinku secured an early lead after defeating his opponent Kuwabara via ring out. However, they lost the second round after teammate Roto was defeated and killed by Kurama. It was now Zeru's turn and he entered the ring to face Hiei. The instant the announcer started the match, Zeru unleashed his flame aura. He launched flames at Hiei, but the latter was highly quick and continued to dodge everything Zeru threw at him. Zeru became more serious and began generating pure heat from his body to the point that he began to glow red. This seemed to not only make him lethal but grant him a boost in physical performance and he lunged at Hiei who despite his immense speed, failed to evade him and was subsequently impaled by Zeru's hand. The hea Zeru generated was intense and set Hiei ablaze and the demon was sent crashing below in a blaze. Zeru scoffed at Hiei and turned away in victory, but stopped in his tracks upon hearing Hiei's voice. Hiei stated that Zeru was good and he almost was reluctant to kill him. But then he started emanating a black aura that became so powerful that black pillars of nergy encircled the entire island on which they were fighting. Zeru beagn sweating with fear as he realized what it was. It was the legendary Dragon of the Darkness Flame, fleames from the underworld that burned hotter than normal flame from earth. Hiei then unleashed the dragon against the helpless Zeru who was engulfed. When the dragon disappeared, there was nothing left of Zeru save an ash shadow adorning the wall on which he was vanquished.
Zeru can emit flames from his body in the form of an aura or throw them towards intended targets.
Zeru can generate heat in his body with intensity to the point that he turns a glowing red. When he impaled Hiei, he set him ablaze due to the immense heat.