I am starting to dig the sin crest idea xD It doesn't exactly go against 'fixing one's issues' either. From the top of what i could see:

Daigo - envy
Nonna - pride
Annalise - wrath
Phascomon - sloth

http://en.wikipedia.org/wiki/Seven_deadly_sins
http://en.wikipedia.org/wiki/Mortal_sin#Mortal_sins

come on, the choices are plenty xD