CometStar and CometSun are twins. Star has yellow horns and eyes, Sun has purple horns and eyes.

They are the daughters of their mother, CometTrail (Comet is a VERY common name for their tribe)

They are the twin princesses from the Stararai tribe of dragons, dragons who live on a comet and explore the cosmos throughout. And they're both currently here to explore your planet and maybe, make friends! (Or enemies if you're not nice)

What happens next is up to you!