Tidewalkers emerged from the sea long ago; they are an ancient species that pre-dates the Sundering. These people are visibly aquatic or amphibian, often covered in scales or sporting fins. They are typically found in coastal or wet regions.
Concept Art

by Chelsea Stoddard

by Chelsea Stoddard
Biology
Tidewalkers hatch from eggs laid in bodies of water. They spend the first few months of their lives in the water as their lungs and legs develop; once they are strong enough, young tidewalkers join their families on land.
Adult tidewalkers cannot breathe water. As they age, young tidewalkers are encouraged to exercise caution when swimming; although the transition is gradual, their ability to breathe water WILL eventually wane entirely. Losing the ability marks the end of adolescence; in some cultures, it is treated as a coming-of-age.
History
Tidewalkers have existed since before the Sundering. They’ve been a common sight in coastal towns, wetlands, and lake-dotted regions ever since.
Touchpoints
Hydrate or Diedrate
Adult tidewalkers are known for their powerful thirst; many if not all tidewalkers carry a flask or canteen full of water to make sure they remain hydrated.
Equal Opportunity Lunch
Many tidewalkers are less-than-picky about what they eat–some have even been known to eat shed skin.