I was watching the mollusk tier list video and I was inspired by some that I saw for a new character concept. Not a super hero but a civilian with a power.

A cute athletic tomboy childhood friend of Jack who has the same properties as the leaf sheep slug. Basically she can ingest plants and for a while she can photosynthesize. It's incredibly awesome because you would need less food to survive and (for a person) would make it way easier to stay in shape. She'd be a case for Jack to consider going public with his power, though hers just makes her life easier. It wouldn't put in question the validity of her accomplishments.

https://en.wikipedia.org/wiki/Costasiella_kuroshimae

Also the colors of the pics I found online of leaf slugs/sea sheeps are great.

Appearance wise, she could also like a human version of the land form of the Shaymin pokemon.