I am having difficulty understanding why ME OCs are kosher, but OCs from other canons are not. I freely admit I have not played ME, so maybe there is a difference I'm unaware of, but it seems to me like crafting a ME OC is not unlike crafting a D&D character. Or probably closer, another MMO character from a character creation screen. You are given a world to work in, you make your character and then you go make your place in the story - big or small.

I totally get the restrictions you put on ME OCs (not related to canon characters, etc) and why they are needed. So why can't you just subject other canons to those stipulations?

Can you please explain?