VTubers are a creative lot, and it's always nice to see the work done on their avatars. Velouria Yoshev doesn't want just a pretty face: they added jiggle physics to the character's legs so they look "like they can be warmed up like an athlete getting ready to run."
Yeah, I'm sure that's what their viewers will think about when looking at these generous thighs.
It's good to see such dedication to the cause from an artist. You can enjoy their avatar on X/Twitter, although most of the images are flirting with the line of what's safe for work, so after you're done, come back to see more jiggle examples on bellies, arms, and monster legs.