Gimble’s appearance is that of a gnome with mushrooms springing out of his skin and mycelium covering his skin. His eyes are dead and empty looking, and he has a large, single mushroom sprouting from atop his head. His face is permanently stuck in a dimwitted stare. He mostly sits around but is extremely responsive to commands and requests, acting almost like a loyal dog.
Gimble is a young adult gnome who has been reanimated as a myco-gnome. When he died, he was resurrected using the reanimation spores of the myconid Sovereign. He was killed by poisonous myconid spores when he accidentally invaded and destroyed part of a myconid spore nest.