Sharko

Appearing in the forth season for a few episodes, Sharko is the son of Marco and a shark appearing as a shark with human arms, legs, and hair. Sharko is a bit whiney and naive, and mostly drives the plot by the strong reactions other characters have to him: Shanks discriminates against him, Debbie is protective, Marco (not aware of being his father) freaks out on seeing a bipedal shark.

Episodes

 * Joy of Grief (Debut)
 * Sharko's Machine
 * Return of Marco
 * Casinko
 * Legacy of Laughter