As the name implies, the Monkey Dude is modeled after a monkey. It has a mostly blue body with a black face, yellow mouthplates and metallic-grey tail. It is always found clinging to trees, watching and waiting for possible targets. Like its predecessor Coconuts, Monkey Dude attacks by throwing coconut-shaped projectiles. Its long, windy arm gives it a greater throwing range.
Sonic the Hedgehog 3
Monkey Dudes appear in the Angel Island Zone where they are found lurking in treetops. When the player is nearby, they will grab a coconut and throw it in the direction of the player. If it succeeds in hitting the player, the Monkey Dude will laugh. However, oddly enough, it will not attack again. No matter how long the player lingers around, the Monkey Dude will only ever throw one coconut. It is easily defeated with a Spin Jump.
Sonic Mania Plus
Monkey Dudes appear once more in Angel Island Zone, which is only playable in the game's Encore Mode. They appear and behave identically to how they did in their debut appearance in Sonic 3.
Sonic Mania Adventures
A Monkey Dude appears in the third episode of the animated webseries, spying on Knuckles the Echidna with its camera eyes and relaying what it sees back to Dr. Eggman, who plans to steal the Master Emerald.