I think with Kpop psuedonyms you could get away with saying "Jonghyun from SHINee" like my friend did with Lisa. Like Lisa doesnt go by anything else despite technically having a last name (i mean she calls herself LaLisa sometimes in her songs but w/e) but I do think you need the "from Blackpink" with a generic name like that.

Other things that come to mind from my niche interests. Pro wrestling, ring names are acceptable right? Some wrestlers, including women, go by mononyms in wrestling. Like just "Naomi" or just "Asuka". Or by names that are... not names like "The Undertaker" (can't think of a female example off the top, actually no there's a indy wrestler who goes by "The WOAD" as an example) lmao.

And then with my RTV example. There's two that come to mind. These are very niche and noone else will care but bare with me

1. I know the names of a lot of the kids from Kid Nation, but not their last names because they werent revealed even in press i'm pretty sure. I think you can find them now, but they werent part of the show so "Taylor from Kid Nation" is what she is famous (ish) by.
2. The Flavor of Love girls go by nickanmes chosen by Flav. The ones who went on to do Charm School had their real names (still only their first names tho) revealed but still, even the most famous one is Tiffany "New York" Pollard and people still mostly call her New York. The lesser known ones like say... Buckeey... would "Buckeey from Flavor of Love" count lmao?

Anyway like I said these are niche and noone else would care but I wanted to express out loud lmao <3 But if someone were judging this contest I do wonder if and how they'd accept these. Like if I'm pretty sure if i said just "Naomi" it wouldnt count, but what about "Naomi from WWE"? Or would I HAVE to say "Trinity Fatu" lmao (luckily in this case I actually know her real life name).