Fishy

Fishy, known as Kiorushin (キオルシン) in Japan, is a virus from the Mega Man Battle Network series. It moves up and down its column until it is on the same row as MegaMan. Once in the same row for a duration of a second, it charges a little bit and then dashes towards the player. In Mega Man Battle Network these viruses flew across the stage only once, while in the subsequent games they flew twice or more, depending on the variant. The Fishy2 (バドラフト) variant leave behind a burning trail of fire circles in the row that it traveled along, which can burn the player, dealing 30HP damage, if they step onto it. Stronger variants deal more damage, move faster during its attack, and fly through the rows more times.

Fishy
Fishys are green and can move very fast. They flew once in the first two games, but in the third game they flew twice.

Fishy2
Fishy2s are reddish-orange and leave a burning trail behind them, after their attack. They flew once.

Fishy3
Fishy3s (ヘルコンドル, "Hell Condor") are yellow. They flew thrice.

FishyΩ
FishyΩs are blue and dash through the screen several times once they start. They flew quince.

Battle Chips
Fishy leaves behind the Dash Attack (ダッシュアタック) Battle Chip. When used, the NetNavi holds a Fishy and dashes forward to attack. The user is invincible during the attack. It has a stronger Fire elemental version named Burner (バーニングボディ).

In Mega Man Battle Network 3, Dash Attack and Burner have stronger versions named Condor (ダッシュコンドル) and Burning (バーニングクロス).