Sorry for the late response, things has busy today 😭
So I want to make an OC x Canon for Coffee Candy Cookie. Kinda just want to develop my OC and their relationship a bit more. Anything to say about Coffee Candy Cookie?
coffee candy is an interesting one. we only see her after she joins the TBD, despite her canonically having a very illustrious career at the Cookie Herald, a news company in the series. her bio states she was a journalist, and her pet bio states her stories frequently ended up on the front page. she was also hired via the TBD scouting her personally, as they never, until recently, had standard hiring practices. although we don't know what kind of journalist she was, from the way she acts in her story, i wouldn't be surprised if she was often on the field or even doing occasional espionage. a lot of the fandom seems to forget about this, though, typically only portraying her as the jumpy, clumsy new hire at the TBD. while thats also a key component, neglecting that the TBD is her second full-time job, and previously she was a star journalist, would be a disservice to her.
she's also canonically insanely dedicated, chipper, and more capable than she lets on. that last bit is likely a holdover from her journalist days; people tend to lower their guard if you act incompetent, after all. we do know she eventually becomes head of the TRD after baguette cookie retires, so coffee candy has more than enough skill on hand to make her way through the TBD. we don't know how she feels about time travel herself, however, and she's somewhat afraid/uncomfortable around Timekeeper Cookie, though that's more likely tied to the fact timekeeper keeps her status as the director a secret from all but the division heads.
in a relationship, this all probably carries forward. her keen observance and excellent memory means that you'll receive gifts or advice you never knew you needed, or she'll pick up that youre feeling unwell from the slightest hints. reading people is one of the things you have to do well to make it as a journalist, after all, though, since the TRD is much more about data entry and collection than talking to people, that skill is no longer as sharply honed. she'll be really attentive to your moods either way, maybe a little too attentive, to the point of subservience, if you don't enforce clear boundaries or lean on her help too much.
while she's pretty clearly capable of enforcing her own will and boundaries, she's also quite stubborn, as one of the endings for her introduction event involves her disobeying baguette cookie and closing a wayward rift herself (in the other ending, she stands down to let baguette do it), meaning that she's more likely to power through things than make her feelings known. so, in turn, you'll also have to be attentive to her moods and needs, and make sure to help her as much as she helps you. a little bit of thoughtfulness will go a long way with her, and even small gifts or reassurances will make her happy. even if she doesn't seem like she needs help, ask anyways just in case, and let her know you notice and appreciate her.
she also more or less canonically has narcolepsy, though it's more of an ongoing gag that she often falls asleep or nods off at work, and it seems to go into remission some time after she becomes head of the TRD (though it may just be better managed at that point). so any experience you have with helping to manage that will go a long way for her. make sure she goes to be on time, help her schedule appropriate nap times, offer to drive whenever you may need to (which will be rarely; cars seem to be at best a luxury in the cookie run universe, and busses, trains, airplanes, animal-powered vehicles, and foot travel all appear to be vastly preferred), and help keep an eye on her if she has an episode while somewhere inopportune. she will be horribly embarrassed by needing help, of course, but she will greatly appreciate you for it.