With me it's usually one of the three reasons:
- I haven't drawn them a proper (or satisfying) reference/icon image yet, thus I feel kind of embarrassed showing it to people when I feel like it's not "up to my standards"
- A profile I don't consider totally unfinished, but something I'm not proud of just yet. It often has to do with their main story progression ie. I'm stuck or haven't started it yet
- The character is an adopted one and I feel terrible getting compliments on designs when I haven't designed them. My ego is fragile
Aabel's character deals with topics so sensitive I don't feel comfortable "forcing" people to interact with something like that, so I usually use him in games where people don't need to read his bio or they can choose somone else if they're not okay with this one
Bambi is a very adult oriented character who deals with themes etc I don't want to force minors to interact with, even if he isn't mature locked or even explicit. I just think it's more of a common courtesy than anything
Chris' profile is here more as a showcase than anything, since he's missing in his main canon work and I don't want to spoil!
Pierre is also more on the adult theme side, like nothing is explicit or anything but I sort of prefer to keep lower profile about the characters who have sexual kind of NSFW themes on their profile since I'm largely known as a SFW artist through and through + most of my OCs are minors so people sometimes forget I am an adult with adult characters too who deal with more adult themes