Sin has a happy-go-lucky and optimistic disposition, and while he isn't the most well-spoken and can be cocky at times, he has a big heart and tries to improve his shortcomings one at a time. He feels uncomfortable in orderly situations and is not too good at social dispositions. While his personality that doesn't look back on what's done may seem insensitive, his simple and innocent personality can be refreshing. Sin appears to have a very deep love for his mother and father, and trusts Order Sol (whom he calls "Old man"), looking up to him as a uncle figure and a mentor unfortunately for Ky.
Speaks in measured phrases, fixates on details, and sometimes trails into quiet pride.
