You're not really wrong, but this doesn't address what OP was asking as I understand them. For them to make the community they're interested in (e.g. Imaginary Knights), they would probably be better off making a new account in a more general instance, as this would be the most straightforward way to do so.

The alternative would be to see if someone else is interested by posting to a remote community (as they're doing now), and seeing if someone in the remote instance might want to make said community so they don't have to make multiple accounts. If memory serves, I think there may be specific communities in other instances (and maybe even one here) to request a community's creation, or if not, I know there are communities for asking if communities exist/help finding them.

E.g. !findacommunity@lemmy.ml

OP, I might recommend looking around for more communities like the above & asking there or maybe searching via Lemmyverse (see sidebar) for whether the community exists on some other instance already.

Edit:
Also it appears my memory was working! There may be more named differently, but here's a few communities where you can request communities.

Yeah, but the instance my account is on (programming.dev) only the admin can create communities and the only communities being made on the instance are programming related communities, which makes sense. So the point I was curious about was if I wanted a non-programming community if there was any way for me to make it without making an account on a different instance.