I just got the evil twin thing this evening and wouldn't you know it, it was of my chief.

So I'm wondering, other than the evil twin having the opposite likes and dislikes, is there anything wrong with them? Are they going to do terrible things to my tribe? Is it ok to make them parents or will their children be bad somehow? So far, other than taking a bit to get working they seem fine (though that head spinning thing at the beginning was definitely creepy).