As a general rule I don’t rp with fic-kin, self-insert ocs or people who identify as their characters. However, I am aware that some RPers self-insert heavily on canon characters just as they would an oc. It all just depends on how much blurring of the ic/ooc divide there is. If I feel like you, the player, are taking IC things too personally, I will disengage.
That said, there are some self-insert ocs that I don’t mind RPing with because I trust that their players can distinguish between reality and fiction and they can understand that they are not actually their characters. Basically, I have to be certain that you aren’t going to let what happens in an RP affect your real life feelings. Aku is a villain. He can be a jerk. I don’t want anyone getting upset because I was playing him in character.
Shipping is where I draw a hard line. I will absolutely not rp a ship with anyone who thinks they are their character or whom I suspect might take things way too seriously. If I’m playing a character and you’re not (because you think you are your character), that’s both unhealthy and it’s dangerous.
The Shogun of Sorrow 