Well, the conflict here is really at the player level rather than the character level. If you have a player who likes wacky hijinks at the same table with a player who wants to be all grim and angsty, they're going to have to figure out how to get along, and banning wild mages or tieflings won't help. One way or another, Raistlin is going to have to coexist with Tasslehoff.At my table, I think it's polite to make sure it's ok with the other players before bringing in wild magic like this, because you're absolutely right. The guy playing the tiefling paladin struggling for redemption is going to feel like he doesn't fit at the table with the sorcerer with a feather beard.
What I'm concerned about is that wild magic should not allow Tasslehoff to force Raistlin into comedy. If Tasslehoff grows a feather beard, that's fine. Raistlin can just sneer at Tasslehoff's lack of arcane discipline. But if Tasslehoff rolls a 73 and makes Raistlin intoxicated, now Raistlin has to act drunk for the sake of Tasslehoff's fun.
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