Santa is a fun guy He is what I like to call the baka boy of Lambdaucifer. He has a short fuse and can get riled up and enthusiastic about things. Not really in a violent way but in an emotional or overexcited way. Santa and Yuki are the ones who first decided to form Lambdaucifer. Santa was in a different band before but after discovering his girlfriend the vocalist of that group in the arms of another guy he left that band and joined Lambdaucifer. Santa can get jealous and competitive but not in such a threatening way as Sakuya can get. And as worked up as Santa gets emotionally he can also just as quickly crash down and be sorry for how he has behaved. HE can show reason you just have to knock it into him sometimes.