The Sorcerer

Yen Sid is a wizard who is creating magic and appears in the Fantasia Segment, The Sorcerer's Apprentice (not the 2010 film). When it is flooded by water, Sid stops the water by using magic and Mickey gave Sid the broom and his hat and he uses his broom to get Mickey out

Other Media
Yen Sid has his named revealed in Kingdom Hearts II. He made his first speaking role here.

Also, he made his appearance in Epic Mickey, painting Cartoon Wasteland, and he retired while Mickey accidentically created the Shadow Blot. At the end, Sid was mad at Mickey and shot magic at the mirror to view differences.

Trivia
The name, Yen Sid has the backwards letters for "Disney".

In Fantasia in The Sorcerer's Apprentice, the directors gave the unnamed wizard the nickname, Yen Sid.