Triton

Tritons were created by the Portcaller. Tritons guard the ocean depths, building small settlements beside deep trenches, portals to the elemental planes, and other dangerous spots far from the eyes of land-bound folk. Long-established guardians of the deep ocean floor, in recent years the noble tritons have become increasingly active in the world above. For most of their history they practiced a policy of isolationism, as they saw the problems of the land creatures to be far removed from themselves, but now they see that some threats can even reach their underwater sanctuaries. The settlement of Vodos Akalo was founded near Drakenstone to open up a line of communcation with the Karixti Empire.

Tritons are a noble and honorable people. They can come off as arrogant to those who live on the land, but that is because they have spent millenia protecting those who live on land from the horrors of the depths and they expect a certain level of gratitude. However, they see themselves as protectors of everyone, and they can prove to be staunch allies. Their ignorance of surface culture also leads to some embarrassing situations for them.
 * Ability Score Increase . Your Strength, Constitution, and Charisma scores each increase by 1.
 * Age . Tritons reach maturity around age 15 and can live up to 200 years.
 * Alignment . Tritons tend toward lawful good. As guardians of the darkest reaches of the sea, their culture pushes them toward order and benevolence.
 * Size . Tritons are slightly shorter than humans, averaging about 5 feet tall. Your size is Medium.
 * Speed . Your base walking speed is 30 feet, and you have a swimming speed of 30 feet.
 * Languages . You can speak, read, and write Common and Primordial.
 * Control Air and Water  A child of the sea, you can call on the magic of elemental air and water. You can cast fog cloud* with this trait. Starting at 3rd level, you can cast gust of wind with it, and starting at 5th level, you can also cast wall of water with it. Once you cast a spell with this trait, you can't do so again until you finish a long rest. Charisma is your spellcasting ability for these spells.
 * 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, and you ignore any of the drawbacks caused by a deep, underwater environment.