- Real Name: Koryak
- Alias: Narwhal,Issitoq
- Identity: Public Identity
- Alignment: Good
- Gender: Male
- Hair: Brown, Eyes: Brown
- Occupation: Adventurer
- First appearance: Aquaman Vol 5 #5 (January, 1995)
- Appearance of Death: Infinite Crisis #3 (February, 2006)
Koryak, the son of Aquaman and the Inuit woman Kako (Corona), was raised by his Inuit mother in her remote village in Northern Canada without ever knowing the identity of his father or the truth about his Atlantean heritage. As a teenager, Koryak was introduced to Aquaman. Aquaman was ill prepared for the boy's temper and attitude, which, in many ways, mirrored Aquaman's own personality. Resentful of Aquaman's close relationship with Tempest, the angry, rebellious Koryak eventually took up residence in Atlantis, Aquaman's undersea kingdom. Against his father's express wishes, Koryak led a great migration of Atlanteans out of the capital city Poseidonis and into the tunnels of its sister city Tritonis. There, he unwittingly released the cruel Kordax and embroiled Atlantis in a great war with the God Triton. As a result of his misguided actions, Koryak was banished from Atlantis. He returned in shame to his mother's village where he still resides.
During Infinite Crisis, Eclipso manipulated the Spectre, to destroy all magic in the Universe. In an uncontrollable rage, he destroyed Atlantis killing Koryak and its population.
In Aquaman: Sword of Atlantis,a young memory less atlantean is manipulated by the Deep Church to kill Dweller-of-the-Depths,so Urlok their god can resurrect. After the funeral of the Dweller-of-the-Depths,Mera accidentally finds his killer and and thinks he looks like someone,Back to the palace she discovers the Koryak's body was stolen,from this she notice that Narwhal was actually Koryak.