Neptune

Neptune (ネプチューン) is one of the Stardroids from Mega Man V, an aquatic Robot Master with a half-human, half-fish appearance. His weapon is Salt Water, a fluid with substances that can corrode metal. His weakness is the Spark Chaser, but as it's only available in the rematch against him in Wily Star and it should be conserved for the fight against Sunstar, it's recommended to use Photon Missile or Electric Shock.

Mega Man & Bass CD data
His weapon can corrode any metal. He is trying to cut down his salt intake.

"Better rust out than wear out."

Good point: Good swimmer

Bad point: Athlete's foot

Like: Bathing in the sea

Dislike: Fishing 

Stage enemies
Enemies in Neptune's stage:
 * Fukuhorn
 * Shuhorn
 * Hyoey
 * Sibul
 * Swim Ball

Other media
In the manga Rockman Gigamix, the Stardroids are powerful space robots that are attacking Earth, destroying several robots in the process. Neptune defeated Knight Man.

Trivia

 * Neptune is an aquatic robot named after the planet Neptune, which is named after the Roman god of the sea of the same name.