Hey look I drew something again.
This here is my OC, Princess. She's probably the oldest character that I'm still using, created back in 2012-ish. She's sort of a reluctant antagonist.
So, anyways. Princess has the ability to open portals of every shape and size on any surface of her body, including any clothing she's wearing. These portals lead to an empty, black dimension full of stars. Also occupying this dimension is a great, tentacley monster covered in eyes and other goop.
It's psychically linked to Princess, so they like to chat a lot and they're great friends. When Princess opens her portals, the monster will reach through with a few tentacles and attack whatever's on the other side. This looks pretty freaky to onlookers because it looks like they're sprouting from her body.