Devil

The term Devil (named after the biblical entity) is used for a recurring type of enemy encountered in several Mega Man series. Although several have appeared in the original series, other variants have popped up in future timelines as well.

Description
The first several "Devil" robots were created by Dr. Wily to serve as one of the last lines defense of his castles from Mega Man's advance. In future timelines however, more advanced designs featuring different abilities popped up, beginning with the Shadow Devil in Mega Man X5. No matter the name, shape or color, they all share one thing in common: A singular red eye situated within a malleable body made out of an unknown substance, the eye itself generally being its weak point as the rest of the body is usually impervious to all attacks. Despite their apparent shapeshifting abilities, their main attacks have often consisted of breaking themselves up into pieces that dart over from one side of the current room to the other and then reconstituting from that spot. Other than their color however, what distinguishes them from each other is in the fashion in which they attack or their sturdiness.

Yellow Devil

 * Main article: Yellow Devil

The first Devil as well as subsequent robots were created by Wily to serve as a last resort to defend against Mega Man's attacks. The Yellow Devil's only attack was shooting its mass as a series of projectiles that would dart over from one side of the room over to the other, but what made it deadly however is which parts it would fire next, giving it a surprise factor. However, it was weak against Elec Man's Thunder Beam. In Mega Man Powered Up, the Yellow Devil broke up into a whirling torrent of spheres before flying over to the other side. Despite its inability to defeat Mega Man, its effectiveness to wear him down has prompted Wily to revise the robot to make it sturdier and impervious to its preceding weakness.

New Yellow Devil

 * Main article: New Yellow Devil

A variant created by the supercomputer Ra Thor to combat against Mega Man as well as being the first variant not constructed by Wily himself. Unlike the previous and future iterations, the New Yellow Devil was considerably more mobile, if not, more agile as it tended to jump around several feet forward or back. Its attacks consisted of an eye blast, a trio of red energy shots and by pounding the ground with either or both its arms. While it had the ability to morph into a mobile puddle to guard against Mega Man's buster attacks, it did not display the traditional mass projectile attack. Despite its name, it was primarily black in color and featured arm and leg bands with ancient symbols lined across their surfaces along with a collar with a similar design, making its design more detailed than most other Devils.

Green Devil

 * Main article: Green Devil

Another variant that first appears in Mega Man 8 in the third Wily Tower stage and then as the first boss of Mega Man & Bass. Rather than being made out of a more solid substance, its main body is made out of something akin to gelatin and its eye is that of a normal color rather than the traditional red, although it was situated within the body. The attack pattern is different for each game, with the pattern from Mega Man 8 being more traditional, but its defense was less than that of its sister models due to the fact that its body could be atrophied away by buster attacks.

Grey Devil

 * Main article Grey Devil

The Grey Devil, much like the Green Devil from Mega Man & Bass, was mostly immobile and its attack consisted of sliding three balls of goo across the floor before sliding to the other side of the room.

Dark Moon

 * Main article Dark Moon

A servant of the Stardroid Terra sent to destroy Mega Man after four of his brethren had been felled in combat. He seems to be considerably larger than the other Devils up to this point as his vertical columns consisted of five blocks rather than the traditional four. While he shares the same mass projectile attacks as most other Devils, he bounces the top two down due to his sheer size.

Twin Devil

 * Main article Twin Devil

A more unique variation. Instead of a humanoid creature, the Twin Devil was in fact two identical shapeless models that worked in tandem. Possessing the ability of flight, they have much dominion of the air and they attack by switching places, shooting pieces of themselves to each others relative location until they've completely reformed and can adjust their height afterwards.

Block Devil

 * Main article Block Devil

Another strange variant. Unlike the other models, as it indicates, is blocky in nature and its pieces can wedge themselves into the occupying room's gaps and it situates itself in the center rather than in a corner. When fully formed however, it fires plasma beams to attack.

Shadow Devil

 * Main article: Shadow Devil

A mysterious creation that appears in Mega Man X5 within the confines of the virus area X and Zero investigate. Often considered the most difficult Devil boss in the entire franchise and one of the hardest bosses period, it is a much sturdier model and dishes out far more damage than one would give alarm for. While it continues the mass projectile tradition, it instead breaks its body up into a 4x5 column of pieces surrounded by an outline of its normal form which inflicts a great amount of damage if touched. Even after it has reformed, it will take some time adjusting as it has the ability to move its eye's position to any part of its body. Its eye can also fire off a projectile. It also has the ability to further change its form, morphing itself into the general shape of a Wily Machine to cover more ground and therefore making itself more dangerous.

Rainbow Devil

 * Main article: Rainbow Devil

Even after a couple of centuries, the Devil design remained alive in the form of the Rainbow Devil. Like the Green Devil, it was covered in an amorphous gelatin, but it was much more mobile and active with its attacks; one of its attacks including a sliding punch. Rather than splitting its mass into projectiles, it flung its pieces around by spinning in one place where the pieces would impact with a small explosion, but remained intact and returned to the main body. Also unlike the other Devils, it was controlled by a head rather than an eye, making it a rather special type of Pantheon.

Lava Devil

 * Main article: Lava Demon

The latest known model, yet again controlled by a head rather than an eye. However, what separated itself apart from others was the usage of magma rather than a specially-made substance. Its design was decidedly more demonic in nature and significantly more advanced since it could control which parts of it were cooled down while the rest of it remained liquid. It often lurched towards enemies or alternatively, separating its mass into falling globs of lava before reconstructing a new body from the lava below.