Seaman's face is actually that of the game's producer and creator, Yoot Sato.

A PC version of the game was in development titled Seaman for Windows Ver. 1.0, and unlike the Dreamcast version which was a game, it would've been more of a communication tool and a pet for your desktop. The program would automatically run when turning on your PC and speak to you in the background. Seaman would also interact with your email, chat features, and other PC tasks. The game was, however, never released.