Delphin

Delphin is an immortal dolphin.

Mythology
After Amphitrite fled from Poseidon when he was trying to pursue her, Delphin chased after her and convinced her to return and marry Poseidon. As a reward, Poseidon turned him into a constellation.

Abode
Delphin is an immortal dolphin and sometimes is said as the god of dolphins.

Family

 * Father: Nereus