My two Thalassodromeus I have in Path of Titans. I gave them matching skins.

Comet was my first Thalasso, a male with a bumpy crest tip, with mostly light blue colours and a red chest/neck.

Meteora (matching name - inspiration from one of the best albums by one of my all-time-fave bands, LP) - a female, has a straight crest with one pointy end and a little smaller crest. Desaturated red and a desaturated blue/turquoise chest/neck. I also gave her some battle damage on her crest.

They aren't romantic partners nor siblings. More close friends.

Comet is more shy, reserved and quiet, loves to discover new places and watching people doing stuff because it fascinates and entertains him.
Meteora is similar, just less shy and isn't as interested in seeing new places and animals and just vibes, doing her business. She can get quite angry when she's been attacked or annoyed. Most of the time, she is even more quiet than Comet - if she was anthropomorphic, she would speak like one sentence in a whole week and Comet would speak for her. Again, she's not shy, just doesn't like to talk much.

Both are very peaceful Thals that almost never hurt anyone, even when starving, they only hurt fish and smaller prey animals - anything else is too dangerous and too much work anyway.