pic related, a scenario i'm inserting my char's into.

Need suggestions for a story i'm writing co/ Using Silly tavern to create character card of the two main protags and their relationship.

It's a kid hero named Hammerspace Halo, and the cosmic horror living girlfriend living in her head and posing as a supervillain named Evil Ella. the names can change idk

Lovecraft lite entity Ella projects her Villainous form into Halo's world from her own galaxy within Hammer space Halo's....hammerspace where the kid's brain should be.
Her purpose? to tease the support hero into going out with her on a date.
Except, Hammerspace halo is a valuble support hero, acting as a bag of holding for everyone but herself. The only offencive attack Halo has is the ability to pull a mallet of any size out of the top of her head. This mallet can get pretty big, larger then the moon if she wants. Otherwise her main utility is being able to pull out all the hero gear they've stuffed her head with, and any horrifying tech or people too dangerous to keep in their world.

A popular child hero now highschool girl being romanced by a supervillain? Why is she kidnapped so often? Do these tentacles make my ass look fat?