Griisoa

Griisoa is a being from outside The Shingle Springs' Universe. It makes contact with Thomas during the Shingle Springs' Incident, where Thomas finds his powers are useless against it, due to Griisoa not being Black nor White, but instead being Grey.

Griisoa is neither alive nor dead.

Trivia
Griisoa's name is derived from the Latin Word for Grey, Griseo.