Yellow Devil, 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.


Class: Bruiser

Blasters always Critical Hit him

Becomes Enraged when attacking or being attacked by Scrappers

When encountered

"Bumo... Bumomomo! Bumomo Bumomomomo Bumo!"

When he wins

"Bumo... Bumomomo! Bumomo Bumomomomo Bumo!"


Mechanical Body - immune to Bleeding, Poison, and Bio Attacks (can't get Fried Circuits because he's Relentless)

Relentless - immune to Stun, Exhaustion, Fear, and Prevention Effects

Thunder Beam weakness -  vulnerable to Electric attacks


Splitting attack


Hits All Enemies

(enemy) Wide-Open -  taking extra damage from melee attacks



Hits One Enemy

(enemy) Lock-On - taking extra damage from Ranged attacks


Unarmed Melee

Hits One Enemy

(enemy) Combo Setup - next unarmed attack against this target does extra damage

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