But the three Nero's are all perfect, how can you possibly come up with a 4th that isn't a rider. Nero classic is one of the pinnacles of soloing quests, being an anchor slot in the back row and generally not dying. Bride is a top tier support that brings some pretty decent ST NP damage that is perfect for boosting overcharge. and Summer is one of the few caster beasts in terms of damage, and able to T1 nuke with a 50% CE, loop wit DSD super scope and waver plug suit, and has two very unique skills with targetable guts, and the ability to ignore berserkers.
So honestly, not sure we need more Neros, apart from a rider, cause every single one if the ones we have are amazing. Also Spoiler: future event spoilers
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Nero classic has even more outfits on the way
Quality over quantity.