Something I just thought of for PC.

Sweetie Belle should get really bored one day and start reading about dark magic. Out of curiosity, she poofs up a glass ball and casts a dark spell on it. Inside the ball, a living shadow forms (like a mini Sombra).

She keeps it as an odd pet because come on, who wouldn’t want a shadow for a pet?

It moves around like a hamster ball, and it kept on a magical leash. It consumes light as food. I’ve been thinking of using “Spettro” as a name for the thing. Nickname: “Pet”.