Sine Faller

Sine Faller (サインフォーラー) is a flying enemy mechaniloid from Mega Man X and Mega Man X: Command Mission.

Behavior
In Mega Man X, the Sine Faller drops down certain ceiling holes. It will fly down across the screen in a zig-zag pattern and try to crash into X. It will retreat back into the top of the screen if it hits X, if X gets too far from it or if the screen pans, having it get too close to the top of the screen. If none of these happens, it will keep flying down toward the bottom of the screen while trying to stay close to X. It can be found in Boomer Kuwanger's stage and in the first three stages of Sigma's fortress.

Mega Man X: Command Mission variations
Sinedropper, known as Sine Faller in Japan, is slightly larger than its Mega Man X counterpart. Sinedropper has a claw hanging from the bottom that holds a Toxic Bomb, which can cause the Virus status. Once the bomb is dropped, they may run away. Unike the original, they can attack with shots.
 * Sinedropper

A Sinedropper is available from the beginning in the Deployment Center.

Zennydropper, known as Zenny Faller (ゼニーフォーラー) in Japan, is as Sinedropper that holds a Zenny bag instead of a bomb. The amount of Zenny it drops when defeated doubles in each of its turn, but Zennydroppers tend to run away.
 * Zennydropper

Gift Box (ギフトBOX) is a variety of Sinedropper that holds an item. The item it drops depends of how many turns it is alive, but they tend to run away.
 * Gift Box