What about yandare sayaka,Asahina or celestia haven’t seen much of that
Thank you for asking! 💜
Yandere Sayaka Maizono
Honestly, I'd characterize her yandere self very similarly to the way I wrote her despair persona in Despair's Throbbing Heart. Which, for those who haven't read that fic, means:
She'd be a very smiley yandere. Not at all deluded about what she's doing, but decidedly never admitting to a manipulation as such. When she punishes her darling for bad behavior, it isn't a punishment; she would never! No, it's just a safety measure that they both agree on. Her darling agrees to everything she asks of them not because they would otherwise be punished, but because they don't want to make her sad. Really, they're lucky to be dating such a huge star, and she doesn't let them forget it. But not in a mean way! It's just the truth.
In general, she's a bit ruthless in pursuit of her goals, and if her goal is to be with this person, she will gaslight and mindbreak them into the exact mold of what she wants from them. All while smiling sweetly and innocently like the pop idol she is.
Rivals for darling's love? First of all, she'll make sure her darling knows it's not safe very nice to ask about them or try to see them. Second of all, she'll use any combination of intimidation, blackmail, doxxing, etc. to make sure the person stays away, if getting darling themself to avoid them doesn't do the trick. If it's easy to get away with having them killed, she'll do that, but more likely she'll use her charms.
Potential darlings for her: Makoto, Mukuro. She could try this on Kyoko, but she'd face a lot more resistance. Which could also be fun.
Yandere Aoi Asahina
She's more honest than Sayaka, and more flexible. She wants to form an actual real relationship, and she approaches that in very honest ways. When she's showing off her athletic abilities, it's accompanied by a verbal "Hey, look at me! Check this out!". She is a genuine friend and partner to her darling. Genuine emotional support. And when she gets protective or possessive, she keeps it behind their back, so they won't feel guilty.
And she is extremely protective and possessive, when they aren't looking. She is extremely unforgiving of slights toward her darling, and she makes sure they won't be repeated. (Slapping Byakuya isn't enough; let her shove him to the ground and put her foot on his neck because he made some wry comment that darling didn't even hear! 🤣)
She won't directly kill a romantic rival (unless they hurt her darling), because she wants to triumph over them. She's a winner! But triumphing over them could mean winning darling's affections from them fair and square, or it could mean pestering the other person until they go away. How much extremely personal mockery and judgement do you think you could take from an Olympic athlete before you stop pursuing her crush?
Potential darlings for her: Sakura, of course. Or Chihiro. Also maybe Makoto, but for once I find the Makoto version significantly less interesting than the others. Honestly, I tend to prefer Aoi as a darling rather than a yandere, but she could still be a fun yandere. Maybe mutual yandere. I kind of love the idea of Aoi and Chihiro trying to hide the fact that they're yandere from each other. And the Sakuraoi speaks for itself.
Yandere Celestia Ludenberg
Despite acting like she wants to be pampered, she's actually really into pampering. She treats her darling a lot like she treats her cat. Meaning she relentlessly and absolutely manicures their whole aesthetic and/or life, and she keeps them in the finest accommodations.
She's similar to Sayaka, in that she's very smiley. Her usual temper is actually directed elsewhere; if her darling upsets her, her smile will drop, but she won't yell at them. She'll find a way to make it someone else's fault, usually, and yell at them. For most people, seeing her temper acted out on other people will be enough to keep them in line. If they do continue to act out, there's a point where she will yell at them, but if they're able to push her to that point, they'll probably be able to handle that.
Cue explosive argument where Celeste tells her darling that she will never let anyone else love them like she does, and other classic yandere stuff. "If you look at him again, I'll wear his teeth as cuff links! Do you understand?!"
Potential darlings for her: Angie, because I'm not letting go of that patroness AU. But Hina and Kyoko are also options. And I like to imagine a kind of platonic thing between her and Taka where they're both kind of protective of each other and she picks out his clothes.
