This is Starlight! She is a Peacock,and a Trans Woman! (Hence the fact she has the Male's blue plumage)
She works as a model for a rich fashion company,but that's what she does during the day. You see,she is secretly thr Superhero known as.......

Supernova! Supernova has quite a few powers,like Limited flight,hypnotism,persuasion,super strength,and Super Speed!

Her weakness is the fact she has to show you her train (the tail feathers) for her persuasion and hypnotism to work. So as long as you don't look,you are unaffected. And this power can also friendly fire.

Her and Splendid's civilian forms know eachother along with their hero identities,but they don't know who eachother are when in hero form.

And,her model work often gets in they way of her hero work,but she does have lots of breaks in her model work since she is one of their top paying models,they gotta make sure she looks good.

And that's it for them!

Heacanon voice:
Merlia from Learning with Pibby