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The most important aspect to a vtuber model is how it integrates into the overall scene.
It should not overpower the main focus of the screen if the vtuber is in streamer mode.
The purpose is to make funny or sexy faces that makes the audience go
>ha ha ha
or
>ooh la la
When the focus is on the model, it should have enough utility that it can be used for skits or "physical" humor.
Vedal's model is genius for this. He is a dumb turtle(forma tortoise), but the moment he put himself on top of Neuro's head he made a million dollar classic.
a vtuber's model is both a way to convey your personality but, perhaps more importantly, it serves as the primary marketing tool.