Aquarians

Stats: +2 Strength or Dexterity, +2 Constitution, +2 Any Mind, +2 Any Soul, -2 Any Attribute
Type: Humanoid (Aquatic)
Size: Medium
Base Speeds: 40ft swim speed and 15ft land speed, or 20ft swim and 30ft land speed.
Languages: Regional, Aquan

Basic Racials

Familiar Environment: You take no penalties to any checks for being in or under water. This includes but is not limited to attacking, damage, movement, skill checks, spellcasting, talking, ETC. In addition, treat rough water as one step lower.
Evolved Gills: You may breathe both air and water without issue. In addition treat your constitution as 10 higher for holding your breath.

Heritages

Merfolk (Fish People)

Sea Siren: Increase the save DC of a single school of magic and any sound based effects by 1. If you have vocal casting, increase the save DC’s of all spells you cast.
Social Curiosity: Gain apprentice rank in a single social skill for free, and a +2 bonus in the chosen skill.

Octopus/Squid

Prehensile Tentacles: Your tentacles are skilled at grasping and manipulating objects. You may interact with and pick up objects at a range of 10 ft even if you do not have a free hand. In addition you gain a +2 to manipulate device checks. You have 5 to 8 tentacles.
Inkjet: As a basic action you may shoot a jet of ink at a target within 30 feet making a ranged touch attack. This target must make a body save (DC 10 + half highest skill rank bonus + constitution mod) or be blinded. This blind remains until removed with a basic action. If this ability is used underwater it creates a 20ft cloud of ink at the target location instead.

Crustacean

Crushing Claw: You gain a pair of claw attacks appropriate to your size, these claws gain a +1 to grapple checks.
Spiky Shell: Gain +2 Natural Armor, and deal retribution damage to melee attackers equal to your Effective DR from natural armor.

Shrimp

Bottom Feeder: Gain apprentice rank in a single harvesting skill for free. When harvesting materials with that skill, increase the number of successes on a successful check by 2.
Dashy Demeanor: You may 5ft step 2 times per turn.

Shark

Blood in the water: You gain advantage on perception and tracking checks against bleeding or wounded creatures. This benefit may apply to other situations involving blood.
Serrated Teeth: Gain a bite attack appropriate to your size. This bite attack also inflicts bleed equal to the number of damage dice the bite has.

Orca/whale

Powerful Build: You count as one size larger for beneficial purposes except for space, attributes and reach.
Pod Hunter: Treat all tactical bonuses you provide to or receive from allies as 1 higher.

Dolphin

Leaping Grace: Treat the DC to vertically jump as the base dc, not at x4. In addition, count as always having a running start.
Friendly Face: Gain a +2 on diplomacy checks and treat people you meet for the first time as 1 step friendlier.

Jellyfish

Venomous Sting: You have a natural poison that you apply with a melee touch attack as a basic action. This poison has the following statline. Type: Contact, Save DC: 10 + Con Mod, Duration: 4 Rounds, Cure: 1 body save, Effects: Poison damage and 1d4 dex damage.
Jelly Body: Due to your jelly-like form, gain 10% natural fortification that stacks with other forms of fortification. In addition, gain advantage on checks to squeeze through small spaces and you can typically fit through any space your head can fit.

Mantaray

Speed Fins: Increase the amount of movement speed gained on consecutive run actions by 1 and your run multipliers limit by 2. In addition gain a +2 to all endurance based checks.
Lazy Gliders: Increase the benefits of your short rests by 50% and decrease the amount of food required per day by 1 meal. In addition, treat the numerical bonuses from quality meals as 1 higher.

Sea slugs

Slow and Steady: Ignore movement penalties from armor and carry capacity.
Colorful Nudibranch: Pick one visual performance skill, gain apprentice rank in that skill for free, and treat journeyman rank in that skill as half price. In addition, when gaining or providing bonuses with an ability tied to that performance increase the benefits by 1.

Sea Turtles

Hard Shell: You gain an amount of natural DR equal to your highest physical attribute modifier.
Wise Wanderers: Pick a single skill used to identify information (1 knowledge, spellcraft, alchemy, magic sight, appraise, profession) gaining apprentice rank in that skill for free and a +2 to that skill. In addition gain 1 rare lore related to that skill.