This is Jessie's angry form. It's rare to see them like this, as they're usually a calm person

Jessie is a Stone Demon, which is why their ink is mostly gray. When angered, their horns and eyes will begin to glow red and they will sprout wings and claws

The reason they're called a "Stone Demon" is because they have the ability to turn people into stone when in this stage

This entire thing is based on an RP I'm currently in with -QueenT_