Triton

Age, Tritons live for around 90 years, reaching adulthood around the age of 18.
Size, Tritons stand around 4-5ft tall. Your size is medium.
Speed, your base walking speed is 30 feet and you have a swim speed of 40ft
Darkvision, you can see in dim light within 60ft of you as if it were bright light and in darkness as if it were dim light. You can’t discern colour in darkness, only shades of grey.
Amphibious, you have a swimming speed of 40ft and can breathe underwater without issue.
Emissary of the Sea, aquatic beasts have an extraordinary affinity with your people. You can communicate simple ideas with beasts that can breathe water. They can understand the meaning of your words, though you have no special ability to understand them in return.
Guardian of the Depths, adapted to even the most extreme ocean depths, you have resistance to cold damage.
Languages, you can speak, read, and write Common and Primordial.