|Relatives|| Older Brother |
Ayumi Otosaka (Younger Sister)
In the past, he and Ayumi were in a research facility. Kumagami instructs Yu to steal the telepathic powers. When a research informs Yu that the scientists were going to dissect Ayumi for her "collapse" abilities, Yu attempts to rescue her by saving his older brother who has the ability to leap time. 
Powers & Abilities
He has the power to possess people. Like his comrades, he has a flawed ability in that his original body would collapse. In a flashback, it's revealed that his true abilities is to plunder, stealing abilities from other people.