Koyomi Motoyoshi

Koyomi Motoyoshi (本好暦) is one of the middle school students. Every since Motoyoshi was born, he's had a weak body and was subsequently bullied. When he met Mimisaka, all of that changed for the better. He's quite possibly the most intellectually smart student (and adult) out of the entire cast, but has a pechant for using sharp pointy objects to show his affection. (http://hokenshitsunoshinigami.wikia.com/wiki/Koyomi_Motoyoshi)