Character biases are in all honesty, completely unimportant. This is because players who intentionally choose Lori or Jazz over Spaz will have to understand that this could make it more difficult for you to get around in many MP levels, in fact probably the vast majority. People who choose non-Spaz characters have no right to complain about character bias because it's a problem they have created themselves - for freak's sake why can't they just play as Spaz like everyone else? Simples.