how we met !
i'll try and keep this short enough; i'm not much for fancy origin stories i'm not directly writing. somebody i knew at the time pulled me into a stream one day to watch a show it had interest in a few years back and thought i would also enjoy; i had heard of it before, and even had been teased by another fan about "hey i think you would like this one character". that show was gregory horror show, of course.
the first episode catherine appeared in was the first time i felt fear watching. the purple tongue, and her suave voice, and of course, her oversized syringe, gave me such a chill, but i've always had a rather embarassing-to-admit mixup between fear and adoration for things.
at the time, i was also falling out of love with another character, but kept it under wraps "just in case things came back". however, meeting catherine made me realize that what i had held onto with that other character was also something i was meant to let go. if i wanted to follow a path for myself and not for others and for the sake of a made-up purity standard i held myself to, i had to move on, and let myself drown in a beautiful red, which some say my body is still located in to this day...
but why her ?
kiss me as if you're punching me, until my lips bleed | hold me until my ribs make a cracking sound and break
there is so much that i adore and admire about my venipuncture princess. i mean...to start it simple; as much as it feels silly to admit, i am not immune to furries. i am especially not immune to an intimidating lizard lady with a sweeping tail. that is as much as i will say on her surface, though i do find the heart-shaped mole besides her eye one of her most defining features, even if it blends in with the rest of her. it's giving electra heart, honestly.
but what really draws me to her is, ironically, what most would and do find disturbing. the love she develops and the crushes she gets that seem to erupt so suddenly into acts of violence. i wouldn't call her a yandere or anything, but like...something close to it. something like that is something i find utterly beautiful. even if it is, in the end, the thing that is destroying her, and keeping her within gregory house's supernatural grasp...there's just something i like about that sort of thing.
and, of course, the one question people tend to ask; but how does she affect MY reality? her mere existance has helped me embrace the more gruesome and strange parts and interests of mine -- i'm a huge horror buff, but i'd always worry if that interest would lead into me being a bad person (such is the nature of my scrumpulosity to lead to thought spirals and whatnot), and to let go of that shame for even the smallest things is nothing but the greatest gift she could've given me back, and i wish i could just do more for her in return. i've also resignated myself to real-life blood donation, which, while not often, is probably our favorite dates.
she's also talented in her own field, of course. you have to have at least some sort of demeaner and belief in yourself to "do no harm", even if the meaning of that is twisted, to go into the field of medicine. props to her, and for that, yet another reason to care for her the way i do. and god, her VOICE. her voice (mostly about the english dub) is nothing short of a siren's song to me. really captures herself as a femme fatale, and gives me those great shivers down my wrists and spinal cord.
i guess you could say i've managed to become infected with the same infatuations she carries. i find myself ripping and tearing at digital walls to see if i've missed any fanart, watching second-hand websites like a hawk for something of her visage to carry with me...maybe our obsessiveness was made for each other. hopefully this means anything at all, but it's not like love needs a reason to stain itself on the carpet like a certain red fluid. 
abridged version;
not sure if this should be on the page about her or us, but seeing as these are mostly "shit i am making up from context" and not actual parts of her source, they'll go here for now. anyways. will be added to in short bursts, probably.
for some physical detailing; seeing as she's a lizard, yet still in such an abstract place, i do not take the concept of cold-bloodedness too literally with her, but she does get cold pretty damn easily. the general air of gregory house tends to be cold as well...she's not one for bulking extra layers, but she'll unconsciously get closer to anyone near her in an attempt to get some body heat off of them. also generally not too conscious of the concept of personal space, but she'll apologize if somebody raises offense to a bump or three.
i usually don't go too much into identity headcanons, but mostly because of how you find the erotic magazine gregory owns in her personal room in soul collecter and some other dialogues, she's probably bisexual with a masculinity preference.
not one to seek out gossip on purpose, but not one to deflect from it, either. mostly just wants to listen to something interesting going on between others, in a way.
while it doesn't bring her as much sastifaction as the actual act of taking blood by far, she also gets some less fetishistic enjoyment in analyzing said blood samples after, but not for too much specifics. has a chart of every resident's blood types somewhere.
only developed a distaste for smoking and the smell of it after a short, but intense crush on hell's chef, but the dislike stook around. occasionally enjoys alcohol on her own time to de-stress.
since i've seen people talk about it; i don't think her last name is karte despite the word being on the sign in bloody karte. it's just a translation for "patient chart" in japanese (with german roots). i only really thought about this after watching guinea pig; devil woman doctor tbh please forgive me for that one. also watch that one it's a good comihorror/medical gore movie.
close to both gregory for obvious reasons, but also gregory mama because of some personality similarities. sometimes they meet up for food and talking about...whatever girls talk about. don't ask me what girls talk about, i don't know and she won't tell me (slash joke).
that would be me, or perhaps a subsection of me, but that is FM, the site mascot for feelingmachine that is...also me, and also my so-called "self-insert" for the twisted world of GHS.
here's a more relevant description that i actually wrote for a commission sheet.
What could now be considered “a distant relative of the TV Fish*”, FM was led to the hotel through its constant conviction that unless it stayed of utter purity in morality and otherwise, it was not worth the space it took up. As a result, it erupted into a sensitive angel, that is also both machinery and a leech (perhaps a leech more than physically – quite the clingy one).
Despite the delusion it carries, it’s become rather attached to the hotel’s nurse, Catherine. Her shameless nature is enough to erupt FM out of its shell to an extent it finds freeing. For that, perhaps it could also be nicknamed “the Bleeding machine”.
As the same as the TV Fish, FM is relatively harmless to any guests that frantically search for an escape, but being around it can provoke the same cognitohazard it carries of scrumpulosity and self-doubt in whoever is around it. You should probably remember your capacity to cause evil anyways, right?