You can breathe air and water.

You can see in dim light within 60 feet 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

You have advantage on an attack roll against a creature if at least one of your allies is within 5 feet of the  creature and the ally isn’t incapacitated.

Your base Ac without armor is 13 plus any modifiers you would get from class features, example:

You have unarmored defense for the barbarian; your Ac is 13 plus your Dexterity score modifier and Strength score modifier

After four hours with your head out of water you have disadvantage on perception checks and rolls that use sight, this increases by one level of disadvantage for every 1 hour after the first four hours up until a maximum of 10 hours where you will be classed as having the blinded condition after the initial four hours with your head unsubmerged you can only remove the condition by submerging your whole head for a total of 1 hour with no intervals other than small 5 minute periods to eat. 

(if you decide to where a item that would or cast a spell to counteract this it must surround you whole head)

Your Strength score increases by 2, and your Charisma score increases by 1.

Depth Drakes mature 15 reach adulthood during their mid forties and live up to 400 but rarely do so.

Dragonborn are taller and heavier than humans, standing well over 6 feet tall and averaging almost 250 pounds. Your size is Medium.

Your base  walking speed is 25 feet, and you have a swimming speed of 40 feet.

You have resistance to the damage type associated with your draconic ancestry.

You can speak, read, and write Common and Draconic. Draconic is thought to be one of the oldest languages and is often used in the study of magic. The language sounds harsh to most other creatures and includes numerous hard consonants and sibilants.