Nebula is a really underrated character. Double Immunities, very effective Ability accuracy reduction against robots (I think it's only against robots, not sure on this one). Absolutely insane shock damage if played right with Proxima Midnight synergy. I'll admit, she has a high skill cap and you take a decent amount of block damage, but she's in no way a bad champion and in need of a rework. Some might even consider her R5 worthy.