The "slug girl" is a 2013-introduced and cartoon-only character and possibly a student at Monster High. She doesn't talk much.
The slug girl is the shy type, with a penchant for following people around without them noticing.
She is a green-skinned girl with short dark green straight hair with bangs and bright green eyes on stalks above her hair, and a face full of dark-green spotted freckles.
The slug girl has a crush on Lothar, but he might as well not know she exists because she is too shy to approach him openly.