I don't understand your comment about no images. !leaky_cauldron@diagonlemmy.social looks like what you want, and I see plenty of image posts there.
If you don't like that community for some reason, you might try resurrecting one of the existing dormant Harry Potter communities:
!harry_potter@diagonlemmy.social
!harry_potter_memes@diagonlemmy.social
!harrypotter@lemm.ee
!harrypotter@lemmy.world
Or, if you really want to start your own community, then by all means do it. Just know that it's a lot of work to get a new one off the ground and build a critical mass of active users.