That was my original idea when I picked a Yuan-ti, just never got into the details. Have a feeling it's not even going to matter given who the DM is going to be running this campaign. He tends to be... eccentric lol. But just for my own RPing I want to give it at least some thought.
Oh evil is definitely something I've taken into account haha. We each had a sort of introductory encounter to go through with a merchant in the woods and I'm the only one who killed him. Did that before establishing my background, so clearly I've got to take that into account now and think of what would have really motivated me to do that. Just need to think of a good reason for why he would be off on his own besides the cliche infiltrator for his people role.