>>26828901Hard to say. Mumei and Fauna have a similar "turns into homing, piercing missile" bullshit but Kiwawa has a multi hitting swipe with high chance to crit and Ame has a lot of natural support for her pistol.
IMO Fauna has some more utility over Mumei's because it spreads out and then homes in rather than homing and going off screen immediately.
Most main weapons are worth the upgrade and only a few are average at best(Ina, I can't see shit with the tentacles in the way, Bae's dice)