Half Sea Siren

You have a swimming speed equal to your walking speed, and you can breathe air and water.

When you reach 3rd level you can choose an upgrade for one of your Siren's Song options:

Harrowing Speech. Your Song of Suggestion lasts for up to one hour instead of ten minutes, and you can cause the target to be frightened instead of charmed.

Cold Sea's Thunder. Your Song of Pain now pushes creatures that fail up to 10 feet away from you.

When you reach 5th level, you can choose an upgrade for one of your Siren's Song options:

Words of Harm. When a creature fails a saving throw against your Song of Suggestion, you can force them to use their reaction to make a melee attack against a creature of your choice within range, ending the charmed/frightened condition from the song immediately after. Additionally, your Song of Suggestion can now affect fey, giants, and undead.

Echo of Pain. When a creature fails a saving throw against your Song of Pain by 5 or more, they're knocked prone. Additionally, your Song of Pain gains an additional damage die (total of 3d6) and gains another at 11th level (4d6) and 17th level (5d6).

You can speak, read, and write Aquan.