Tokimitsu shares much in common with Ai in that both of their aura codes start off undefined. Later, it is revealed that Tokimitsu carries the gravity, or "dark" aura. Tokimitsu later takes on the name Gyurazu after his aura code. He is capable of drawing aura energy out of aura carriers, sometimes killing them outright and leaving their bodies as dried mummies.
Tokimitsu is a pet project of the Aura Development Center. He is obsessed with gaining power and becoming "complete" by having Ai's light aura coded into him. He currently is without aura power after facing the full power of Ai's aura. He is the only one to have done so, and it is he that first names Ai as an aura master