This is the alien girl that's got a kink for everything Human.. which Morty is. :)
As with all characters that dont have human body parts, (legs), stable diffusion will add them for poses needing them. Be sure to use specifics like Slither instead of Crawl, etc..
Triggers: s8mortygf, 1girl, solo, monster girl, blue skin, pink eyes, no nose, tentacle hair, aqua hair, aqua lips, (no legs:1.2), fewer digits, purple choker, white shirt, short sleeves, pink stripe on sleeves, vest, pink belt, maroon skirt, pleated skirt, slime trail
Additionals: purple tongue, forked tongue
Trigger Notes:
Monster Girl - will often include legs, but those legs will closely match the arms and body in style.
Slime Girl - In the event of legs, this will often maintain the no legs look but with each leg.
Slug Girl - This seems the maintain the no legs look the best, but will still break if poses require leg joints.