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Narm: Some of the avatars can be seen as very uncanny and somewhat hard to take seriously, having odd animation issues that distract from the stream if one looks at them long enough:
For instance, Minato Aqua's facial expressions, especially in her debut video (which her current incarnation cringed at during an APEX Legends stream), come off as very uncanny. Even some of her more recent expressions can come off as derpy, especially if she's trying to convey some emotion (this particular one for instance happened when she was upset that she was about to lose a match in Smash Ultimate) and it comes off as her being overly happy due to her smile instead. These expressions (her actually screaming while being burned by lava in Minecraft in two different occasions) also carry onto her casual avatar as well, although it's not as extreme.
Matsuri has a similar instance as well, mostly due to her early model's inability to have anything but a wide open mouth when speaking. Her "2.0" Live2D model finally addressed this by giving her avatar more expressions and better face tracking.
Watame's default expression is a smile that gives her an almost V-shaped mouth, something that looks very odd when her avatar's mouth moves a lot. She lampshades this in her membership announcement stream and demonstrates a (then-newly developed) expression that turns her mouth into a more natural-looking horizontal line.
For the more well-endowed characters, the rigging of their Jiggle Physics makes their chest move like a pair of balloons or something out of a zero-gravity environment, making said jiggle physics more funny or weird to look at than titilating. It's especially noticeable on Kiara and Reine's avatars.
The hololive app tends to do weird things with Live2D avatars when trying to interpret blurry frames, usually messing with the eyes. This is most noticeable with Gura's avatar, which starts blinking rapidly and repeatedly if she's not looking directly at the camera.
Most of hololive's "Home 3D" models don't track facial movements well. As a result, their faces often get stuck with their mouth either agape or in a toothy grin for long periods of time, making them seem like they're ventriloquists.
