Yellow Devil

The Yellow Devil can be defeated by attacking its weak point: the eye. Defeating the Yellow Devil will cause a giant explosion that will damage other fighters. The Yellow Devil (, Yellow Devil) is a boss hailing from the series. It is a gigantic robot, the first combat robot created by Dr. Wily, originally appearing as a fortress boss in the first game.

Origin
The Yellow Devil originally appeared in , where it served as the stage boss for the first stage of that game's Wily Fortress. It is made of a shape-memory alloy originally created by Dr. Light which was stolen by Wily during the events of the first game, although the control chip acting as its eye, allowing it to break apart and reform into its humanoid form, was unfinished rendering the Yellow Devil unable to move. It used attack patterns similar to its appearance in Smash 4, splitting into multiple parts and moving across to the other side of the stage. The Yellow Devil is notably a hard boss in the Mega Man series since the split parts of it make it hard to dodge and predict, and that it will repeatedly split again after opening its eye (its weak point) to fire a beam at the player. The Yellow Devil's weakness was the Thunder Beam, which was obtained by defeating Elec Man.

The Yellow Devil reappeared in the remake of the first game, , where it spoke in its own language comprised of the word "Bumo". The playable Robot Masters also make an attempt to communicate with it; Ice Man appears to understand it but says that even though the Yellow Devil has a mission, he has his own mission, too. Cut Man and Oil Man (a character exclusive to the remake) both insult it by copying its language, although Oil Man intentionally does so while Cut Man was trying to appease it. Bomb Man however demands that the Devil speak in a language that he can understand. While playing as Proto Man, he instead threatens the Devil that one shot at him will blow up his nuclear reactor, vaporizing the entire fortress. Here, it was weak to Fire Storm, which was obtained by defeating Fire Man.

Some of his other appearances include ', ', , and other spinoffs and remakes.

As a stage element
The Yellow Devil appears in both versions of Wily Castle. It attacks players by shooting lasers out of its eye and splitting into sections and moving to the other side of the stage, mimicking its behavior in the original game. It can be damaged by attacking its eye, and once defeated, it causes a large damaging explosion, similar to the Smart Bomb. The player who lands the finishing blow on the Yellow Devil is not harmed by the explosion, and any KOs caused by it will count as their attack.

In Smash Tour
The Yellow Devil appears as a random event: bumping into it will initiate a battle against it in Wily Castle. If not defeated in time it transports to another spot in the map, but it retains any prior damage.

Trophy
The Yellow Devil trophy appears in both versions. In it is part of the Mega Man Trophy Box.

In Super Smash Bros. Ultimate
Due to Wily Castle returning, the Yellow Devil returns as a stage hazard in Super Smash Bros. Ultimate.

Spirit
Yellow Devil also appears as an Ace-class primary spirit. It can be summoned using the cores of and.

Trivia

 * When Mega Man was originally released outside Japan, the Yellow Devil's name was changed to "Rock Monster" due to Nintendo's policy against religious references at the time. This change was reverted in the Sega Genesis remake Mega Man: The Wily Wars, and the original name was retained ever since.
 * A similar case occurred with the Yellow Devil's successor in Mega Man 3, the Yellow Devil MK-II. The Nintendo Power guide renamed it as "Rock Monster" just like the original. The Tiger LCD game renamed the Devil as "Vengeful Villain".
 * The Yellow Devil does not appear in Mega Man 2, which is the source of the Wily Castle in the background of the eponymous stage.
 * Despite carrying the Yellow Devil's design from Mega Man, the Yellow Devil in SSB4 seems to have the same pattern of the Yellow Devil MK-II from Mega Man 3.
 * In the PAL version of Super Smash Bros. 4, the Yellow Devil is referred to as male.

Yellow Devil