W. D. Gaster

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W.D. Gaster
Undertale character
"spr_mysteryman", a sprite believed to be W.D. Gaster in Undertale
First game	Undertale (2015)
Created by	Toby Fox

W.D. Gaster, or simply Gaster, is a character from the 2015 video game Undertale who was the previous "royal scientist" for the game's underground kingdom of monsters before he vanished mysteriously. He cannot normally be encountered in the game, and is never discussed directly as part of the game's main narrative. Players can only encounter events related to him either by luck or by modifying certain game files. A sprite from one of these events, internally named "Mystery Man", is generally used to portray W.D. Gaster, though the sprite's connection to the character is not confirmed.

The existence and nature of W.D. Gaster has been the subject of speculation among both fans and critics. Multiple theories exist about him, including ones that suggest that he is related to Sans and Papyrus. It has also been argued that his name is a reference to the Wingdings font, indicating that he may be a skeleton like Sans and Papyrus, who are named after the fonts Comic Sans and Papyrus.^[1]