His approach to doing things in general will be if it doesn't benefit him, he won't do it. He'll need a motive to help people if they ask, be it money, or returning a favour, however will have no problem lying to people if he deems it necessary.
If he's in a group and everyones sticking to a plan, he will most likely do his own thing, unless it's the smartest choice for his well being.
He's the sort of person that would turn up in his own time, even if it means he's going to be late, thats if something else doesn't come up before hand, not a person many people will be relying on