Greystash

"Some days I feel like a powerful grand wizard, trapped in an alcoholics body."

- 's unlock message.

 is a limited-time character that was released on October 17, 2017, as part of Act 2 of the Treehouse of Horror XXVIII Event. He was the seventh and final prize to be won in the event's Act 2. He is a counterpart of Homer.

He returned on October 3, 2018 during the Treehouse of Horror XXIX Event as a possible prize in the Magical Mystery Box (2018)

About
Headmaster Greystach is a deceased headmaster in the Angelica Button series by T. R. Francis. Greystach's defining feature is his impressive mustache, several feet long on each end and endowed with special powers. When Homer skipped to the end of the final book and discovered Greystach was killed by evil wizard Malicious Krubb, he invents a happier ending for Lisa. In this new ending, Greystache says "mustache powers activate", granting his mustache powerful muscles. The evil wizard is clobbered to death, and Greystach saves the day. However, Lisa kept another copy of the book under her pillow and read the real ending but decided Homer's ending was better.

Trivia

 * From Season 18, Episode 8 “The Haw-Hawed Couple”.
 * He is a parody of Dumbledore, from the popular children’s book by J.K. Rowling, Harry Potter