Rangda Bangda

Rangda Bangda (ランダ・バンダ) is the boss of the second Sigma stage of Mega Man X. It is the face in the background, and it has moving eyes, a nose gun, and its mouth is a pit of spikes. To make matters worse, it can move its walls inward to try to force X into the spikes. In Mega Man X, the best weapon to use is Chameleon Sting.

Rangda Bangda W
Rangda Bangda W is a modification that appears in Mega Man X5 with an Egyptian look, and a Egyptian remix of the fortress boss music from Mega Man X. It's more difficult then the original Rangda Bangda. It has three eyes, each with a different color and attack, that appear one at time from one of the two eye cavities. The blue eye will move straight in the player's direction, the green eye will shoot, and the red eye will spread several projectiles in two directions. When the walls move to limit the player's movement, a small, miniature sunlike object will follow the player and spikes will appear in the floor, and sometimes in parts of the wall. It's recommended to use X with Gaea Armor against it. Rangda Bangda W, along with the boss that preceeds directly before it, the Shadow Devil, are considered two of the harder bosses in the entire Mega Man franchise.

Randam Bandam
In Mega Man Zero 4, a similar (though much smaller) robot, named Randam Bandam, appears in the second final stage. While similar in tactics to the X-series version, players find its repetitive laughter much more annoying than the boss itself.