The Hypno Baron is one of the Barons of Sequin Land and is the third boss of Risky's Revenge. He dwells in his sealed fortress Hypno Tower and holds the third Magic Seal.

He appears to be a shape-shifting skeleton (possibly a Cackler) wizard who can take the form of anyone he wants, and during the boss fight takes the form of Uncle Mimic. He must have either known Uncle Mimic or have the ability to read Shantae's mind to do this. His shape-shifting is probably just hypnosis, if his name is anything to go by. Strangely enough, his character sprite has empty eye sockets with glowing red lights, while his artwork and character speech box have cartoonish eyeballs.

As Uncle Mimic he has the ability to teleport and he has three different attacks, he never physically hits Shantae but instead attacks from afar. His first attack is using his finger as a gun, which is so powerful that it will knock Shantae back. When Shantae is standing on the ground he will use his second attack, throwing a beaker on the ground which will send two shock waves to the right and to the left. His third attack is used when Shantae is standing on pillar, a barrel or is hanging on a chain; The Hypno Baron will throw a beaker that rises a high flame from the place where the beaker landed. Shantae can prevent all attacks if she attacks the Hypno Baron just before he is about to use any of his attacks. The Beaker attack can be stopped easily but the finger gun is very hard to prevent.

At first, the Hypno Baron will teleport 3 times. When he has taken 100, 120, and 140 damage, he will instead teleport 4, 5, or 7 times, respectively. After 140 damage he also gains a speed boost.

When the Hypno Baron has taken 159 damage he loses his Uncle Mimic appearance and only the skull of the Hypno Baron remains which can't hurt Shantae and only has 1 health. When Shantae defeats it, she is rewarded with the third seal.

Hypno Baron returns in Half-Genie Hero. He summons Squid Baron to license his merchandise; Shantae and Rottytops mishear and believe that Hypno Baron is summoning a giant monster to destroy the world. In the ensuing boss battle with the Squid Baron, Hypno Baron joins the fight halfway through.