He is Tomoyo's half brother. Though he is a NEET (Not in Education Employment or Training), he spends most of his time engage in "Fairy Wars" where he fights with other people with special abilities or "power users" like himself. His special ability is the "Pinpoint Abyss" where he opens up worm holes that sucks his opponents in, to which they get transported to their previous location prior to the encounter without any memories of what just happen. He is also like Jurai who has some degree of chunni delusions except that his delusion were at bit real. Though a lone-wolf, he can sometimes be in the company of other people who are also "power users" and were also engage in fairy wars.

Prior to being a "power user" he used to attend college and even had a job.

He dislikes being called by his real name and prefers to be called "Kiryuu Heldkaiser Luci- First."

(Source: Animefreak, edited)