Cockroach Twin

Cockroach Twin (コックローチツイン) is the name of the two boss enemies at the end of Cossack Stage 3 in Mega Man 4, fought one at a time. The first one stays on the ceiling, and the second walks around the whole room in a clockwise pattern. The room has spikes on the bottom, so the player must be careful when jumping. Drill Bomb, Ring Boomerang, and charged Pharaoh Shot are the best options against them.

Damage Data Chart
Amount of damage in units that each Cockroach Twin receives from each Special Weapon in Mega Man 4.

*For the Mega Buster and Pharaoh Shot, the first digit is when the weapon is fired normally and the second is when it is fully charged.

Other media
Cockroach Twins have a cameo appearance in Mega Man Megamix.

Trivia

 * If the player uses Flash Stopper to finish the Cockroach Twins, they will not be able to leave and will have to die or reset the game. If the player uses Wire to finish the enemies (using it when they are on the ceiling), then they will be stuck there until the player drops.
 * The Cockroach Twins are the only bosses from Mega Man 4 absent in its manga adaptation.