Ariel the Little Mermaid (1992)

Despite being based on the 1989 movie, the game's story bears little resemblance to that of the movie. The player guides one of Ariel or King Triton through underwater levels similarly to the game Ecco the Dolphin, and can move in any direction. Despite who the player selects, both characters play the same, and feature two attacks for defeating enemies, a "normal" and a "special". (wikipedia.org)