Mawverne

Mawverne (モンバーン) is the boss of the second Gear Fortress stage in Mega Man 11. It's a magenta-colored robot encased in a spiky shell who attacks by cicling around and firing red energy spheres at its foes. It houses primitive sphere robots somewhere in its shell which are released three at a time. These will attempt to home in on a target, attacking them with a bash. At low health, Mawverne will activate its Power Gear and blast several energy beams at its target in quick succession, exposing itself in the process.

Mawverne's shell is held together with an electromagnetic clasp. By continuously attacking, Mega Man can weaken its bond enough for the shell to burst open, exposing Mawverne on the inside. While open, Mawverne will fly in the reverse direction. If attacked during this period, it'll retaliate with a barrage of energy shots.

Mawverne's weakness is Bounce Ball, hinted at by the electric bond keeping it's shell together. It'll cause the shell to spring open with a single shot.

Mega Man 11 Gallery
This combat robot is an offshoot of the development that went into Wily's latest Wily Machine. It's equipped with armor thick enough to repel any attack.

Wily originally intended to create two versions fitted with a Power Gear and a Speed Gear respectively, but when he realized how much time it would take to build the outer casings out of the special steel used in Metall helmets and Sniper Joe shields, he limited himself to creating just one.

That said, the incredible defensive capabilities of the resulting robot have Wily glowing with pride.

Trivia

 * "Mawverne" may be a portmanteau of "maw", in reference to its prominent mouth, and "mauvern", a color similar to magenta.
 * Mawverne's design is similar to Circring Q9 from Mega Man 5.
 * Its energy attacks appear to be the product of the Power Gear.