>>19820560A good design is like a good book cover or the cover of video game, it attracts your attention because you are seeing something beautiful, cute or sexy and you want to see more of it. From the moment your attention is picked, however, it's completely up to the vtuber's personality and content to keep you hooked and not leave when the initial attraction or novelty of her design wanes.
This happened to me with Baelz, I absolutely fucking love her original design, and I think it's one of the most sexiest and cutest of Hololive, but I simply never got around to watch her streams, I only cared for her design and nothing else.
While the opposite happened with Polka, I wasn't a huge fan of her design, but her Legend of Polka content made me start watching more and more of her content and is one of the few Hololive members I actively watch.