I once had a space RP where someone basically added transformers in the RP (with funny names admittedly) and there was even arguments in the OOC over it, it was funny as fuck as a dude who had a faction that was a blatant copy of the soviet union for the most part called the transformers guy out on his copying of transformers and it led to a slap fight over whose faction was more original.

The transformers guy had no real story lines beyond one liners and stuff but I wasn't bothered by this because I am more laid back when running things than the OPs I make may make you think and I like OOC infighting, it's entertaining.

I never accepted his app but he RP'd in the IC anyways and I don't think I even bothered banning him over it due to how horribly undisciplined a GM I am.