Powie

Powie, also known as Flappy, is a virus from the Mega Man Battle Network series. They hop around their area for a short while before jumping over to the player's side and becoming a weight that crushes down on the square which the player is standing on, cracking it in the process. They land faster as their version level increases, and their damage pattern changes to encompass more surrounding panels.

Powie/Flappy
Powies are white and gray.

Powie2/Flappy2
Powie2s are red, and their quakes leave an aftershock that can still damage its target if the target is within the range of one panel (on the same column).

Powie3/Flappy3
Powie3s are yellow, and their quake aftershocks are cross-shaped.

PowieEX/Flappy
PowieEXs are light-blue, and their quakes leave an aftershock that can still damage its target if the target is within range (same column)

Powie2EX/Flappy
Powie2EXs are purple, and their quakes leave an aftershock that can still damage its target if the target is within range (same column)

Powie3EX/Flappy
Powie3EXs are dark-green, and their quake aftershocks are cross-shaped.

BigFlappy
BigFlappys are white and gray. This is normally the large version of regular Flappys when they are quaking their target. However, in Mega Man Network Transmission, this appears as a regular virus that continuously floats up to quake down. It paralyzes and damages MegaMan if he is still grounded.

Battle Chips
Quake, known as Earthquake (アースクエイク) in Japan, is the Battle Chip family dropped by Powies. It summons a Powie to crush the target and crack a panel. The Program Advances Beta Quake and Sigma Quake allows Mega Man to use Quake multiple times for a short time.

Other media
In the MegaMan NT Warrior anime, StoneMan used Quakes in the N1 Grand Prix.