Rikuo, or Aulbath in Japan, is a character in the Darkstalkers franchise of video games, debuting in Darkstalkers: The Night Warriors. He is a merman based off the titular creature in the 1954 film Creature from the Black Lagoon. He has a wife named Aqueria with whom he has several children. He has made several cameo appearances in various other video games and media, as well as featuring in his own mobile phone game.