Fishy, known as "Kiorushin" (キオルシン,"Kiorushin") 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,Badorafuto) 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.
Fishys are green and can move very fast.
Fishy2s are reddish-orange and leave a burning trail behind them, after their attack.
Fishy3s are yellow.
FishyΩs are blue and dash through the screen several times once they start.
Fishy leaves behind the Dash Attack (ダッシュアタック,Dasshu Atakku, Dash in the first game) 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,BurnerBurning Body in Japan, Body Burn in the first English game).
In Mega Man Battle Network 3, Dash Attack and Burner have stronger versions named Condor (ダッシュコンドル,CondorDash Condor in Japan) and Burning (バーニングクロス,BurningBurning Cross in Japan).