Understandable, as if you've never heard of Jessie you'd think this was a Spider family story, considering the other character involved is Black Cat. She's only had two previous appearances, in 1994, a two-part story in Marvel Comics Presents involving Wolverine.
Jesse is a mutant with empathic chameleon powers, and happens to be Marvel's first ever trans character.
https://marvel.fandom.com/wiki/Jessie_Drake_(Earth-616)