Pronouns: She/they/any
A cheerfully amoral but generally harmless mad scientist who "terrorizes" a small Minnesotan town (perpetrates kinky chaos that the residents are largely indifferent to, you know how wish fulfilment settings are.) A former human who genespliced herself into her current form in the spirit of reckless experimentation and spitting in the eye of God. Although she's well versed in big clanky machines, toon physics gadgets, and transformation ray guns, she specializes in potions and serums, including developing and distributing bespoke fantasy-HRT regimens.
Dominant-leaning switch, equally happy to transform herself or be transformed.
Q: "is there any backstory to how doctors hyland and mutable met?"
Dr. Mutable has been making her hometown steadily weirder since failing out of university and Dr. Hyland originally moved there to fulfil simultaneous goals of: being in collaboration-range with a like-minded mad scientist, being in a place where she doesn't particularly stand out day to day¹, and needing to get away from the wreckage of a werewolf rampage quick-like. There was some polite if arch/supervillainesque mail correspondance about their research at first, and then one of them inevitably ambushed the other with an experimental transformation ray and it transitioned smoothly to a sort of Narbonic x Spy Vs Spy scenario.
¹: it's a mixed human/anthro universe anyway and Dr. Mutable is not the only one breaking the laws of biology over her knee so Hyland is not, like, a "fleeing from cryptid hunters and government researchers" kind of anomaly. But she is visibly Weird.
Q: "what are mutable & hyland's respective labs like, if you've thought about it? i assume "vague cartoon mad science lab" but like, underground lair? spooky castle? floating fortress?"
Mutable has a shiny modern laboratory whose surface level is sort of passably normal but it sits on top of an apparently endless labyrinth of basements and sub-basements which can be quite strange as you get deeper. Bubbling vats and ominous lights and entire rooms packed with strange machinery of no obvious purpose, and so on. Meanwhile Dr. Hyland does all her science in an ominous rundown mansion out in the woods. Terrible lighting, creaky floors. Every shelf, bench, and cabinet is a complete jumble of tools and parts and random junk with no discernable order to it all but she'll yell at you if you try to move anything.
* Artfight