These are all MC-specific.
A = Aftercare (what they’re like after sex)
Coda goes into aftercare mode as soon as you're sated. They'll pull you against them, rub your muscles, kiss your shoulders/back/forehead. When you've come down a bit, they'll check to see what you need or want. A shower with them or alone? A warm washcloth? Water? They won't overwhelm you with questions, though - they know you'll tell them what you need once they prompt you (and they'll know your preferences if you've been together before/have been together for a little bit).
B = Body Part (their favorite body part of theirs and also their partner’s)
Coda loves their hands - they love your mouth.
C = Cum (anything to do with cum, basically)
Coda isn't a massive fan of having cum on their body. If you like them coming on you, they'll do it, but it doesn't do anything for them personally. They do swallow, though, and enjoy it.
D = Dirty Secret (pretty self-explanatory, a dirty secret of theirs)
A lot of times Coda would prefer to stay at home and masturbate with porn than meet up with one of their FWBs. They still do it because they want to keep their skills sharp in case they can land you ;)
E = Experience (how experienced are they? Do they know what they’re doing?)
They have a lot of experience both with academic knowledge and in practice. If you've dated before, they also know your body very well and still remember many things that used to drive you wild. If not, they're attentive enough to quickly pick up on them.
F = Favorite Position (this goes without saying)
Between your thighs or you sitting on their face.
G = Goofy (are they more serious in the moment? Are they humorous? etc.)
Mostly serious, but they've been known to randomly quip to lighten the mood.
H = Hair (how well groomed are they? Does the carpet match the drapes? etc.)
They keep things trimmed and neat at all times.
I = Intimacy (how are they during the moment? The romantic aspect)
Very attentive, very intense. They consistently pay attention to your body's reactions, noises, and needs. They chase whatever makes you feel best and milk that for all they can.
J = Jack Off (masturbation headcanon)
Nightly before bed, unless they've recently enjoyed your company.
K = Kink (one or more of their kinks)
Swallowing their partner's cum/cleaning them up after an orgasm
Praising their partner
Light bondage/restraining their partner
L = Location (favorite places to do the do)
Their bedroom (bed/wall/you perched on their dresser or desk). The kitchen. The living room couch or the floor.
M = Motivation (what turns them on, gets them going)
You. It can be something as simple as a cute smile or biting your lower lip - random little things will trigger them into needing you.
...Also if you pop into their room in lingerie or naked and act like everything is normal. They will lose it. No brain, only need.
N = No (something they wouldn’t do, turn-offs)
No sexiness at their clinic. The hospital in general is strictly off-limits.
No exhibition.
No threesomes (they think?)
O = Oral (preference in giving or receiving, skill, etc.)
Prefers giving and loves it. They'll go down on you all the time if you let them. They're exceptionally skilled - so much so that they might inadvertently get you off too soon for their liking. If you have a refractory period, Coda will wait impatiently. If you don't, they're getting back to work for at least one or two more climaxes.
P = Pace (are they fast and rough? slow and sensual? etc.)
They usually start slow and sensually unless you've been building them up for a while. If that's the case, they get rougher and more demanding.
Q = Quickie (their opinions on quickies, how often, etc.)
Eh. They're OK with them but prefer to take their time with you. Sometimes a quickie is the best you've got, though, and they'll happily deliver in that case.
R = Risk (are they game to experiment? Do they take risks? etc.)
Coda doesn't knock anything before they try it, especially if it's something you're into or want to try. They aren't too much of a risk taker, though. They'll need you to voice the desire and give them time to research how to do the activity as safely as possible.
S = Stamina (how many rounds can they go for? How long do they last?)
They can hold off from orgasming for a long time - they're very good at edging themself. That being said, they have a long refractory period once they come. They have the stamina to keep servicing you in other ways for as long as you want, though. Weariness doesn't exist until you're satisfied.
T = Toys (do they own toys or use them on a partner or themself?)
Coda owns a few toys, yes. They'd be fine if you used said toys on them, but they'd rather focus on you. If your relationship gets deeper than surface-level FWB, they'll buy some toys to use on you in conjunction.
U = Unfair (how much they like to tease)
Only a little bit. They don't tease much once you're in the bedroom, but before that, they'll be a little bit of a brat to get a rise from you.
V = Volume (how loud they are, what sounds they make, etc.)
A typical volume. Their praises and grunts aren't whispered, but they're adjusted to suit the room and mood. When they climax, they lose a bit of control and get a bit louder than they'd like.
W = Wild Card (a random headcanon for the character)
Coda has masturbated to you many times when you've been in the shower. They aren't proud of it, but it's hard not to think about you when you're so blatantly naked right there.
X = X-Ray (let’s see what’s going on under those clothes)
Coda is tall and lean but surprisingly muscled. With their clothes on, you wouldn't suspect that. Their chest has a faint trace of back curls that feather down a toned abdomen and into a trimmed, neat bush. Their cock is long and on the slender side, though it does bulk up when hard.
Y = Yearning (how high is their sex drive?)
Fairly high. It's higher when you're in a FWB. It's even higher than that when you're in a committed relationship.
Z = ZZZ (how quickly they fall asleep afterward)
It takes a while for them to come down afterward - they need to ensure you're tended to. Only once you're sleepy or ready to part ways will they let themself fall asleep.