>>8121908That's probably most of it. Her humor isn't that bad, she's a fun collab partner, and if she puts her mind to it, she can be not bad at games, which makes it easier to watch when you're not being frustrated at them being awful at whatever they're playing.
She has a ton of interesting stories when she gets the time to talk about them. Even her family members are interesting on their own, with Anemachi having a cult following and her mom being a member of her channel while being super supportive of her work. Her antics in real life are some stories to behold, like recently when Toko shared a story of Suisei ordering eggplant doria without the eggplants.
She also has that ambition that drags you along her dream. When you realize where she comes from, you can't help but support her in realizing her goals, especially when you see all the effort she takes into making them a reality. The conviction she has can move mountains.
Aside from that, her design is amazing. The colors, the theme, how easy it is on the eyes, how it's simple on the whole while filled with insane amounts of detail that all cater to her as a whole, she's great to look at even if you don't wanna watch whatever game she's playing.
She has a lot of moments where she's pretty dumb, but she's pretty intelligent where it counts too. Suisei barely had any moments where she was in a scandal. She's as safe as safe can get, probably. She mentions that she butts heads with management the most out of all the holos but she never gets on their bad side, if such a thing exists. She wants to bring the best out of herself and that brings her to get the best out of others.
There's also her dedication to her fans. As you said, she keeps her fans at a place to just cheer for her, instead of forming parasocial relationships with them. She often goes and berates us, insults us, and so on, barely giving any GFE material if at all, saying that we don't deserve it and we never did anything to do so. However, that doesn't mean she doesn't love her fans, she goes out of the way to give back to the fans in other ways, from amazing lives, great songs, cover songs most every month, and putting out multiple amazing performances for free. She knows that she owes it all to her fans and she would never want to alienate us, even the ones who started with her from before she started hololive.
All in all she's quite the character. Hard to explain what is quite good about her, but if you like her, you just know.