Base Class: Monk
You spent may days and nights on a ship. Testing your monk skills and your calling to the sea at level 3 you start to get more of a bond with the water enabling you to use it to your advantage.
Water Dancing
Starting when you choose this tradition at 3rd level, You gain the minor illusion cantrip if you don’t already know it. As an action, you can spend 2 ki points to cast water breathing, water walk and control water. without providing material components.
Water weave
At 6th level. When you are in water, as a bonus action you can teleport up to 60 ft. to an unoccupied space you can see that is also in water. You then have advantage on the first melee attack you make before the end of the turn
Water Elemental
at 11th level. When you are in water over 5 foot deep you can use an action to summon a water elemental.
Opportunist
At 17th level, you can exploit a creature’s momentary distraction when it is hit by an attack. Whenever a creature within 5 feet of you is hit by an attack made by a creature other than you, you can use your reaction to make a melee attack against that creature.