Seifer is a loud and outspoken rebel. His friends, Raijin and Fujin, call themselves a "posse".

Although Seifer is belligerent and rude with delusions of grandeur, Seifer is troubled rather than evil. He has been bullying other people since he was young and is considered a "problem child". Seifer defies authority figures and believes that others should defer to taking orders from him. He acts impulsively, and his rash decisions get him into trouble until he feels he can no longer back out.