Stephen Shin

Shin helps Arthur develop his powers, but turns on his protege when he refuses to reveal the location of Atlantis.

[2][3] Some years later, Aquaman and Mera visit Shin, asking for his help to identify strange sea creatures.

[4] It is later revealed that Shin previously knew Black Manta and met Arthur and Thomas Curry when the former was a child.

[5] Stephen Shin is later seen in the underwater Triton Base while Aquaman is fighting a sea monster called the Karaqan.

When a diver named Coombs is attacked by sharks and saved by Aquaman, Shin brings him to the Triton Base for treatment.