That makes sense, and I agree it should be a sort of case-by-case. But the problem is that the DM is new, very unfamiliar with the rules, and is also very loose with them. Enough to keep the game structured, but not enough of a rules monger that it becomes difficult.
The main purpose of the game is for everyone to have fun and enjoy ourselves. That being said, it would become difficult for everyone to enjoy themselves if their character has been rendered moot by something like that.
The game has already started. It was started at lvl 5, and we're currently lvl 9. We've got a monk, a sorc, a rogue, and an oracle. We've also got a drop in/out summoner for the group. There's alt. class features from the advanced book, and similar stuff. What I was talking to with the DM, would be potentially the half-celestial template on the oracle (who is actually a 2nd character being played by myself for sake of party survivability).
It would be partially background fluff, and story progression. The way it would come about would probably be through the cohort, as it is a viable conduit for this stuff...however I'm getting side tracked.
Is there anything anyone can offer for solid word on what to do here? I really don't want a party unbalancing, and me and the DM aren't quite experienced enough to make a proper call on this ourselves. So anything solid I can get would REALLY be appreciated.