Winged Sunfish

Winged Sunfish is a fairly strong monster that sends a Walking Water at you. It's not that difficult to dodge, however.

The remake adds it as a mini-boss later down the line, though it's not all that tough either way due to magic being massively buffed. It however does gain an Ice Wall spell.

Enemy Formations
Winged Sunfish x 1

Winged Sunfish x 2, Gloom Wing x 1

Winged Sunfish x 3

Winged Sunfish x 3, Gloom Wing x 2

Trivia

 * Winged Sunfish is Enemy Byte Value 4 in the coding.
 * It has a counterpart in Magma Fish.
 * Most of the Fish monsters use Walking Water, except for Magma Fish, who uses Magma Ball.
 * Winged Sunfish is now a Water monster in the remake, further separating the idea.
 * Winged Sunfish and Fish Man both drop Honey Bread. Fish in general are known for liking Bread in itself.