Black Manta

Black Manta is a DC comics supervillain and an archenemy of sorts to Aquaman - he is an evil criminal genius who has created an advanced suit that allows him to breath underwater while also having a number of in-built and external weaponry designed to combat Aquaman and other heroes that get in his way.

Black Manta is one of Aquaman's most famous and powerful opponents and has appeared in varied media associated with the hero, though due to copyright complications he was renamed Devil Ray in the Justice League cartoon series - he would appear under his usual name of Black Manta for Batman: The Brave & The Bold.