Kabatoncue

Hippoplatter (referred to in Nintendo Power as the "Hippo Launcher") is a mini-boss enemy which appears in Mega Man 4 (NES) and Mega Man IV (Game Boy). Hippoplatter shoots homing missiles from its mouth as its method of attack. It can only be damaged by shooting the platform columns until it is low enough to be shot directly. Without resorting to special weapons, a fast and concentrated attack is needed to destroy it.

Mega Man 4
In Mega Man 4, two Hippoplatter appear in Ring Man's stage. Common strategies include using the Flash Stopper to freeze movement while attacking with the mega buster or using the Rain Flush to remain a safe distance while dealing damage. Another option is using the Pharaoh Shot due to its ability to be directional, however, as this weapon is Ring Man's weakness, it is generally better to conserve this weapon as much as possible.

Mega Man IV
In Mega Man IV, two Hippoplatter appear in Stone Man's level.