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Voice? I guess not, Mumei sounds exactly like her, does the same cute noises, and she is a total flop.
Being dumb? Most of her mates are just as dumb as her, and they are total flops.
Maybe character design? Her design is more iconic than the others.
Mumei design is generic as fuck, her colors are not vibrant enough.
Fauna has green hair, but her default outfit looks like something out of genshin impact, generic as fuck.
Ame is also generic with some pastel colors.
Calliope has a more distinct design, but that is a copy of Megurine Luka.
Kira design is also distinct, but her face is a little meh.
Can we all agree that the most important aspect of a vtuber is the character design? If it is shitty the vtuber is bound to become a failure? No matter how hardworking the person is?