Evil vs. Being a ****

[Pilo]

If the character behaviour is the problem, cursed items are for you:
This could be change in a nice crown instead of a regular helmet.

This could be change in a nice not so expensive gem.

This would be fun too.

Stealing from friends should be a bad thing. Furthermore, even if they don't see him steal them, they may find out something they used to own is missing. If it happens while someone out of the group can't do it, then they can confront eachs other and find out.

This may help: http://www.giantitp.com/forums/showthread.php?t=248164

I think stealing from party member could be considered as betrayal.