>>1179639>>1179763>>1180296Mukiroze is unforgettable just by virtue of her association with ark and reddit dragon.
Mel has been whoring herself out and is now fresh in everyone's minds. She's also the poster girl for workplace harassment.
Sora is and will always be legendary daisenpai.
Roboco is one of Yago's bottom bitches and an intrinsic part of the daisenpai brigade.
Azki is literally the unforgettable "what even is she" bonus character that everyone remembers simply because she was always completely out of place in Hololive until she got her new model.
Chris, Shion, Ayame, Mio and Luna are the more responsible/forgettable ones since they tend to do their own thing and aren't really generating memes, controversy and clips on a daily basis, nor do you hear about them shooting themselves in the foot.
Then there's spade echo, Doris and Rosalyn who were complete literal who's for the most part, as their bread and butter was mostly billibilli and they didn't really get clip buffed.
Most of the holostars are forgettable to hololive fans except for aurun who always gets recommended by youtube for reasons, winning son, playboy astel, and oga who frequently collabs with fubuki. Daidou is also a non entity in most people's mind.
And despite being in bed with a ton of holos, tamaki only collabs with them in her own channel so a lot of people don't realize she's a heavily associated act until they discover her. The same goes for kagura mea, aqua's best similarly autistic friend. Shigure ui, kagura nana and pochi are the other secret expanded universe characters who are directly related to various hololive characters. Ina didn't even stream her collab with pochi and pals, making her that much more of a literal who to EOPs.
There's probably some Nijisanji characters who are frequent cameos and another honorary part of hololore, but that's so far down the rabbit hole you either need to have been around for a while or know some decent Nihongo to play high speed catchup. That's what makes them forgettable, as they never really get talked about despite also being involved in various holo streams and collabs.