Art and character design by Punctuation! character belongs to me.
Text crossposted: It took me this long to come up with a name oops. Mallo is a smallish (3 foot tall) monster who sneaks into houses and makes off with shiny valuables, food, and socks. But only one sock - never a pair. That one the drier "ate"? It was probably Mallo, using them to wear over her tail when it gets cold out.
She's generally a timid creature, but can be easily lured out by the smell of food. She's semi-intelligent and can lean simple concepts as well as language, but baser instincts to hoard socks and eat will always overrule any more complex needs.

Mallo could be kept as a pet so long as you've got a secure cage, warm house, good food, and an endless supply of mismatched socks. Mallo's very good at breaking out of cages and climbing, so make sure it's locked up well!