User blog comment:Lordranged7/Voting for Pics/@comment-11088379-20121217110817/@comment-11088379-20121222095108

His keshin is from a toy which his parents left him named Kousoku Toushi Robin (explains why Nanobana knows his keshin name). Fei thinks he's being abandoned, thus he thinks his parents gave him the toy to prevent him from being lonely, thus he hated the bunny and when it turned out to his keshin he hated it so much till he doesn't use it. However, seeing their desperate plays, he started to use his hidden powers. Some might not turn out to be true but this is from what I see in the latest episode.