Yellow Devil

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Yellow Devil
"Bumo... Bumomomo! Bumomo Bumomomomo Bumo!"
―Yellow Devil, Mega Man Powered Up

Yellow Devil (イエローデビル Ierō Debiru?), also known as Rock Monster or Yellow Demon, is a giant and the first combat robot created by Dr. Wily, originally appearing as a fortress boss in the first Mega Man game. Its body consists of yellow goo-like shape-memory parts that can dismantle and cross the screen to attack his enemies. His only weak point is his red eye.

Video game appearances

Mega Man

The Yellow Devil can be very difficult to defeat, due to his complicated attack pattern, and his tendency to change forms after getting hit once or twice. His weakness is the Thunder Beam.

Mega Man Powered Up

In the Mega Man remake, Mega Man Powered Up, it is revealed that the Yellow Devil can talk, but the only thing he can say is "Bumo", which he says in various ways in order to form his own language. Cut Man attempts to speak it, but without much success as it only seemed to insult the monster. Ice Man appears to understand what the Yellow Devil is saying, however, and says that even though the Yellow Devil has his mission, he has his own mission, too. Oil Man just copies his "bumo"s. Bomb Man doesn't understand what he says and tells him to speak in a "language that can be understood".

His attack pattern in New Style is different from the original. On Easy Mode, he will just stand in the same place and reveal his eye to shot energy spheres. On Normal, he splits in parts like the original game. On Hard, he also splits in parts, and fires a laser beam at the player either from the ground or the wall. To avoid the ground laser, the player has to stand at the wall and jump at the correct time. To dodge the wall laser, the player just has to run near him. Sometimes he will try to crush the player with his hand. He is weak to the Fire Storm.

Mega Man: The Power Battle

Yellow Devil appears as the penultimate boss of the "Mega Man 1~2" and "Mega Man 3~6" courses. In the "Mega Man 1~2" course, he jumps back and forth and sometimes takes a round form to attack with a laser. He uses his body to attack by splitting in nine parts that fly across the room, throwing a cube-shaped part of his body that bounces across the room, slam enemies with his hand to pull the target into his body and launch them at high speed, and blasting his upper body into four fists diagonally to punch foes. His weakness is the Super Arm.

In the "Mega Man 3~6" course, he only jumps back and forth. After taking a small amount of damage, the Yellow Devil splits in three smaller versions of himself with horns. One of the miniatures will fight in the ground, jumping around and attacking by firing three small projectiles or splitting in three parts. The other two miniatures will walk around the ceiling and attack by releasing three large energy spheres. After the small version in the ground takes some damage, it will jump to the ceiling and change places with other miniature. After all three receive enough damage, the Yellow Devil will reform and jump around the room. He is weak to Gyro Attack.

Mega Man 2: The Power Fighters

Yellow Devil is the penultimate boss of "Rescue Roll!" course. His attack pattern is similar to the "Mega Man 1~2" course from Mega Man: The Power Battle, except that his splitting attack changed and the four-way fist blast was removed. He can walk and defend against attacks in this game. He is weak to Thunder Beam.

Mega Man: Battle & Chase

Yellow Devil is one of three enemy racers (the others being a Roader and Sniper Joe). There is also a secret boss recolor of him called Black Yellow Devil (ブラックイエローデビル Burakku Ierō Debiru?), sometimes shortened to Black Devil.

Super Smash Bros. for Nintendo 3DS / Wii U


Yellow Devil in Super Smash Bros. for Wii U.

The Yellow Devil is set to appear in the fourth installment of the Super Smash Bros. franchise. He acts as the main stage hazard in Wily Castle, being deployed from the castle itself in the background. He behaves and fights exactly like his 8-bit counterpart, firing blasts of energy from his single eye and splitting up into multiple projectiles to reform on the other side. Players can choose to fight him by attacking his exposed eye, his only weak spot. If defeated, the Yellow Devil will release a highly damaging explosion, which will count as an attack for the player who dealt the final blow.

Other appearances

  • Yellow Devil has a cameo appearance in the opening cutscene of Mega Man 8.
  • The Yellow Devil was shown in the first trailer of Rockman Online, but the game's cancellation as well as lack of footage with him make it impossible to determine where he was intended to appear and what role he was supposed to play.


Damage Data Chart

Displays the amount of damage in units that Yellow Devil will receive from each Special Weapon from the original Mega Man.

Mega Man
Arm Cannon Rolling Cutter Super Arm Ice Slasher Hyper Bomb Fire Storm Thunder Beam
2 2 -- 0 -- 2 4

Other media

Mega Man (Archie Comics)

The Yellow Devil appears in the first issue when Mega Man is entering Wily's fortress, however during the fight, the scene cuts to the (chronological) beginning of the story. The battle's conclusion is shown in the fourth issue. Mega Man destroys him with the Mega Buster as he doesn't want to use the weapons copied from the Robot Masters. Despite its defeat, the concept of Yellow Devil would inspire further evil creations, including the Chaos Devil and the Ra Devil. The former of these two created by combining Yellow Devil technology with the creature Chaos in a cooperative effort between Wily and Dr. Eggman, Chaos being a native of Eggman's world. The Ra Devil was created as an improvement upon Wily's design by Ra Moon, who sought to turn Wily's own work against him as the doctor had attempted to do by creating Ra Thor.

Short Circuits

Prior to the Worlds Collide crossover event, Yellow Devil did not make an appearance in the Short Circuits series. During the crossover, however, he did appear in one of the Off Panel strips of the Sonic the Hedgehog series, in which he is seen talking to Tikal the Echidna, who attempts to convince him that violence is not the answer to his problems.

Mega Man Megamix

Yellow Devil is the large robot who stands guard within the main control room of Wily's fortress. His body parts are composed of an organic ferromagnetic polymer gel, and each part is controlled by a nucleus-like core. Changes in the magnetic field allow it to take on the distinctive Yellow Devil form. What appears to be its eye is the main core that controls its entire body. Wily believed Yellow Devil to be his greatest creation ever, but due to the fact that Yellow Devil's core could be disrupted by a strong electromagnetic pulse, the Thunder Beam proved to be his ultimate weakness. All the Yellow Devil can say is the letter "W".

After the defeat of Dr. Light's six Robot Masters in the story "The Birth of Mega Man", Yellow Devil holds Mega Man as he meets Dr. Wily. Wily tries to convince Mega Man to join him, but as he refuses, he orders Yellow Devil to crush him. Mega Man manages to escape Yellow Devil's grip by using Guts Man's strength, breaking his arm, and then finishes him off with a Thunder Beam.

Rockman (manga)

Yellow Devil appears in Wily's fortress. All it says is sounds like "Gururu".



  • A glitch in the original release of the first Mega Man game allows the player to quickly defeat Yellow Devil by shooting him with the Thunder Beam and repeatedly tapping the pause button when it makes contact. Every time pause is toggled it will register a hit.
  • In the U.S., Yellow Devil's name was changed to "Rock Monster" in early sources due to a policy Nintendo had against religious references in NES games at the time.
  • In most of his appearances in different Mega Man titles, Yellow Devil's primary weakness tends to be electricity-themed weapons. The Green Devil and Shadow Devil bosses from Mega Man 8 and Mega Man X5 also have an electric-based weakness; Thunder Claw and Tri-Thunder respectively, with Tri-Thunder acting almost identically to his weakness in the original Mega Man, the Thunder Beam.
  • The Yellow Devil (or rather Devils in general),Vile from the X series and to a lesser extent Copy X from the Zero series have a pattern of appearing in the first game of their respective series, then the 3rd game in the series, then in the 8th game (obviously this doesn't apply to Copy X as there were only 4 Zero games.) Interestingly both Vile and the Devil have a green variant. However it should be noted that only Copy X and Vile were the same individuals each time while the Devils that appeared were all different.

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