River 

Physical Attributes: Short, black hair dyed blue. Green eyes. Tanned skin.

Usual clothing (warm weather): Black athletic shorts with white trim (like on the end and the waistband) and a teal shirt. Grey tennis shoes with teal laces.

Usual clothing (cold weather): Black sweatpants with white strings. White shirt with teal sleeves. Teal jacket. Grey tennis shoes and/or combat boots with teal laces.

Name: River Whitney
Gander: Male
Age: 14
Family Ties: Parents and a twin sister named Marley.

Species: Falconyn, Water Dragon, Human (will be explained)

Abilities: Can breathe underwater through gills on his sides and see in the dark.
Allergies: Peanuts, bee stings, cats.
Instrument: Reed pipe. Drums.

Favorite Activities: Swimming. Bird-watching. Reading.

Personality: Literally the chillest person you will ever meet. Kinda shy, and when around his love interest he will very commonly stutter and trip over his words. He also tends to be slightly self-conscious.

Marley

Physical Attributes: Sun-kissed skin from outdoor activities, sparkling blue eyes, and long black hair dyed blue at the tips.

Usual Clothing (no matter the weather): Jean shorts and tank tops. Either black tennis shoes, blue sandals, or fluffy black boots.

Dressiest clothing she'll wear: A blouse and skirt.

Name: Marley Whitney
Gander: Female
Age: 14
Family Ties: Parents and a twin brother named River

Species: Falconyn, Water Dragon, Human (will be explained)

Abilities: Can copy any sound as long as she's heard it before
Allergies: Pollen. Cats.
Instrument: Flute. Xylophone.

Favorite Activites: Swimming. Stargazing. Thinking.

Personality: Chill and a bit tomboyish. Defensive about crushes and the like. Not sensitive to words but they will get to her eventually.

The species thing works because basically, their father is a Falconyn and their mother is a water dragon-human hybrid. Then this works because all of the currently redefined dragons can turn into humans, however if they do that, they can never go back to dragon form even though their genetics still say they're dragons.