Fishy

Fishy 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 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.

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

Fishy3
 Fishy3s are yellow.

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