All of my f/os are listen on my profile and in this post
But if you want a brief summary of everyone and their relationship with my sona(s).
Empress is the 3rd boss of House of the Dead 4 and Loving Dead: House of the Dead EX. She stands in the way of the protagonists of both games and fights them in a subway train/train station. In my AU (that's a wip) it survives the train that hit her in HotD4 and only saved Battie from a hored of Creatures because they were falling out of line and now the little nycter is head over heals for her but it doesn't know that
Mukago is from Demon Slayer and she one of of the 12 Kizuki, ranked Lower 4. Not a lot is known about her because she only appears in one epsiode/chapter and dies practically the moment she is introduced. In an AU, taking place in the Kimetsu Academy universe, she's the head of Muzan Kibutsuji's marketing division. She falls in love with the house cleaner that works for her best friend, Urogi's, dad
N Gin is from Crash Bandicoot and he is a reoccurring villain in the series. He's a mad scientist who lost his mind after a missile he built crash landed into his dead. He turned it into a life support system, turning himself into a cyborg. After a minion was chucked his way by his master, he slowly started to grow affection for Bat-Terry until it escalated to a full-on relationship
Nicolette the Weasel (known as Nicolette the Jerboa or Nic the Mastermind in my AU) is a very minor antagonist from the Sonic the Hedgehog comics made by Archie Comics in the 90s. She's Nack the Weasel's (also known as Fang the Sniper/Hunter or Jet the Jerboa) twin sister and was a bounty hunter like he is before he tried to send her to Chaos with same day shipping off panel but he failed in my AU and she took over a good portion of the crimimal underworld within Central City and rules it as a mob boss
Oswald Cobblepot, also known as the Penguin, is from DC comics and has three different iterations that I selfship with. But what they all have in common is that they're all a thorn to Batman's side
-> DCAU (Batman the Animated Series and The New Batman Adventures) Penguin is a theif turned entrepreneur and the owner of the Iceberg Lounge. Battie and Ozzy had been old friends and promised they'd fall in love after both of them were out of prison. Battie is a lounge singer at his establishment and is his information broker behind the scenes
-> Burton-Schumacherverse Penguin is Batman Returns' beloved charismatic, sewer-dwelling, antagonist (one of three antagonist actually). He aimed to become mayor to reenact a burning vengeance he had against Gotham ever since his parents abandoned him in the sewers due to his deformities and homicidal tendincies. In my AU he successfully becomes mayor a few years after he survived and recovered from the fall that killed him in the movie. Battie is his secretary and is just as deliciously devious as he is
-> Matsudaverse Penguin is one of the countless antagonists Batman has to fight in the Batman 2004. He is a bitter former nobleman from Manchester, England hellbent on reclaiming his family fortune through crimimal means. Peri and Gale (primarily known as the Kabuki Twins) are his henchmen and girlfriends. Battie was also a henchman of Oswald's that he promoted to be on the same rank as his masked assassins
Reala is one of the primary antagonsits of the NiGHTS series. They are the twin sibling of the series' eponymous protagonist and the loyal right-hand Nightmaren and head enforcer of Wizeman the Wicked. In my AU Reala, Wizeman banishes Reala to the Waking World after they failed him too many times and they just so happened to crash land in Battie's yard. The same visitor that they, for a reason they don't know, felt affection towards.
Zavok the Zeti is from the Sonic the Hedgehog series, debuting in the critically panned Sonic Lost World, and is the leader of a group of antagonists called the Deadly Six. After escaping Dr. Eggman's enslavement he vows to kill him and a shared enemy, the eponymous Sonic, but is stopped every time. In my AU, Battie vowed to kill Zavok after he ruined a party that she hosted but the pair accidentally fell in love
Bowser Jr is an antagonist from the Super Mario series and, as his name suggests, is Bowser's son. He's the heir to the Koopa throne. One Junior Clown Car accident sent him into Battie's world where she takes care of him until he can find a way back home. He calls Battie "Mama"
Kotoko Utsugi is the Fighter of the Warriors of Hope, a group of elementary-aged antagonists from Danganronpa Another Episode: Ultra Despair girls, and is formally known as Lil' Ultimate Drama. Her motivation in starting the apocalypse is to get back at all of the adults that "didn't save her" from her past. (Can't go into it without putting some MAJOR TRIGGER WARNINGS). But after her loss, she found herself in Battie's world. Being the only adult that was both kind to Kotoko and having no... very certain motives towards her, she clung to them for safety in the new world. She calls Battie "Aunt or Auntie"
Like Zavok, Metal Sonic is an antagonist from the same series. Only he was introduced in Sonic CD as it's secondary antagonist. He was built my Dr Eggman to defeat and replace Sonic as the world's Fastest Thing Alive. However, one fight with his arch-nemesis involving the Chaos Emeralds sent the nearly-demolished robot into Battie's world where she and Bowser Jr helped repair Metal Sonic. He calls Battie "Administrator"
Zohakuten, like Mukago, is from Demon Slayer and is a member of the 12 Kizuki. He's the manifestation of Upper Moon 4, Hantengu's, hatred. After a fight with a hashira gone wrong, he found himself in Battie's world where he nearly got into a scuffle with the police. Battie took him in just before the sun could rise and houses him to keep him safe from it. (The sun is a demon's weakness). He calls her "guardian"
Hope this is a good introduction to all of them