Including unstructured artistic/creative activity on Common App?

I enjoy a certain type of artistic activity. (To protect anonymity, I’d rather not elaborate on what kind.) I’ve never taken a class in it or anything; it’s purely a hobby. I create fanworks and I have a significant audience online. I’ve won local competitions, and they’re all linked to my online profile, which I’d prefer not to make known to colleges.

To show myself as a well rounded individual, I’d like to include this in my college applications. But I don’t think my work is particularly appropriate for an arts supplement, so I’ve mostly just talked about it during interviews (where I can hold interesting conversations about it) and in supplements where there are multiple prompts. However, this makes me concerned I don’t sound legitimate in my interests.

A few questions:

Should I include this activity in the Common App activities list? (My activities list is 8/10 full, and I don’t want to sound like I’m padding my application. Also, being very busy lately, I don’t think I’ve spent as many hours/week dedicated to it as I’d normally like, so it might sound meaningless.)
If I talk about it elsewhere on my application, do I have to include it on the Common App activities list to sound sincere about my hobby?
Would including it in additional information instead be worthwhile?
Can I include winning local competitions without specifying them to the point of identifying me online, or would that sound suspicious? (There’s nothing in my online profile that would cause my application to be denied, but I don’t really want to share it with colleges.)

i would say yes. do you think it is okay for me to enter an essay into the additional information section?

Maybe if it’s a short one? Probably not more than 350 words (or shorter if the supplements themselves are shorter.) Depends on the college and the essay.

(I’d still love second opinions on my original questions!)

It might be a good idea, if you list this creative outlet, to put a few pieces into the Portfolio section too. My daughter uses a lathe and makes wood bowls and vases, we took some photos and loaded them in, it wasn’t difficult.

Can you give a reason why you wouldn’t want to share it with colleges? Is it controversial in any way? Can you elaborate without being too specific? I think it can help to show artistic accomplishments especially if the activity is non structured. It show that you are capable of self directed activities and can excel at them.

I don’t think it’s controversial; mostly, integrating “online” and “real life” activities is something that makes me uncomfortable in general and the things that I’ve put the most effort into are fanworks, so I’m afraid they’ll be looked on less positively because of that. Similarly, I could put some pieces in a supplement, but I’m not sure how they will be judged for that reason.