Fin is one of Triton's dolphin companions, recognized by a sleepy-eyed appearance. He belongs to a close-knit group with Ruka (who rescued and raised Triton), Uru, and Karu. Fin and his pod actively wage Triton's one-man war of vengeance against the Poseidon family, ignited by the genocide of the Triton clan. As Triton's primary allies, these dolphins provide crucial support through battle, reconnaissance, and transportation across the conflict. Despite his perpetually tired look, Fin exhibits a noted liveliness and spirited presence during adventures. The dolphin group remains integral throughout Triton's journey, from the initial confrontations with Poseidon's forces to later safeguarding Triton's children.