Sweet Slither is a survivor, a scrounge, a scientist, and the equal of most any ninja. "Super-soldier" fits nicely.
While she can be brutally honest, she has more secrets than a kingpin's vault. Despite her obvious lack of "social graces," it is obvious that she has a big heart.
Calling her a "mother hen" is an understatement. To come under her protection is equally reassuring and scary.
When she agrees to become part of the staff of a superhero academy, both she and the students will be in for an education!