I think my Torrent, Chesna, might be a nice friend for him.
She's a mermaid that wanders away from home (an Atlantis-esque underwater civilization) only to wind up in an australian reef. She soon gets taken in by an Ontra that gives boat tours to fuel his surfing obsession (Osborne). She's naiive when it comes to the surface world, but is actually quite knowledgeable about ocean currents and wave patterns.