Tidal Whale

Duff McWhalen (Tidal Whale, "Tidal Makkoeen" in Japan) was an old sea Maverick Hunter before being infected by the Sigma Virus. He shoots out blocks of what appears to be ice. The C-Shot and C-Sword cut through these, and also damage McWhalen well, as it is his weakness. Duff guards the ocean, which has the Hydrogen necessary for the Enigma laser.

Stage Enemies
Enemies in Duff McWhalen's stage, the Ocean Floor. U-555 [Rest of list needed]

Fun facts

 * Duff McWhalen's stage music is a remix of Bubble Crab's stage music from Mega Man X2.