Oshino Shinobu has been a long time favorite.
Lately Blue Archive has had a lot of top quality lolis, it’s hard to pic a favorite. The Game Dev club(Momoi, Aris, Midori, Yuzu(back)), Iroha, Hoshino. There’s more, these are just ones off the top of my head.
Even if Burggit becomes an island in the fediverse, I don’t see that as an issue. I currently enjoy the community we have here, if I need to view discussions on another instance I can just make a different account there. It’s not that different than having multiple rddit accounts for different topics. It’s actually a bit easier as I don’t have to log out of one to access another.