De Vil comes from a noble family yet he defied them.

He's incredibly smart and agile. A genius that can take you into glorious surprises. His eyes are two different colors: Lavender and turquoise. 

He teases people for fun and uses them for his own deeds. He's unpredictable and has two older brothers.

A sadistic clown.

Vi De Vil is highly intelligent, however, because of his genius mindset, it drove him crazy. Kidnapping people, mostly male people using them as his test subjects.

He is hard-to-get, a genius!,  Yet he likes to tease people. He has a soft side though, when someone asks if he's alright, he will get all gentle and honest with his thoughts..

nobleman's greatest spy 

Frostwind swordsman.
Kaeya is the Cavalry Captain of the Knights of Favonius. He is held in high regard by the people of Mondstat – even with all eccentricities and secrets. 
A genius who really likes to tease people of Teyvat (Mondstat)
He is the spy for the Kingdom of Khaenri'ah(ultimately) and is a master of swordfighting, he has high intelligence and his vision, Cryo which grants him the power of Cryo(ice). Kaeya is obsessive over Traveler, Aether and he loves him very much, anything for him

Aíno comes with a long red hair to his hips. His eyes are flaming red and he stands tall, wearing a robe.

He's a genius, a strategic person and best in martial arts or any sort of combat. He's aggressive everytime, he wields the element of flaming Red Dragon. And is the youngest master of their tribe, he has charms and good eye.

young Master of the Red Dragons' tribe

Arthur with the IQ of 231, an intelligent nobleman in England in 19s. He is loaded rich, balance unlimited. He's a man with many faces, he will never show his true identity to the public, he's a manipulator yet no one knows.. He gets obsessive over love, he will get obsessive over the person he loves at first sight, and will not hesitate to torture the person if they don't love him back. But the world sees him good and gentle.. Inside... Its all just an act.

noble

He has a cream white hair, with calm dull light blue eyes. He was like an angel from heaven..

He came from the mountains yet he had lost his memories. He is highly intelligent and somehow considered to be mysterious because of his unknown ability.

He is a calm man, a patient one but push his wrong buttons and death might come knocking at your door.

a calm nobleman, no intention of violence.

Joseph is one of the most high ranked noblemen in the 19s of England. However, he has an IQ of 239 making him own lots and lots of faces, his plan flawless and will always go as he plans it to be. His personality, his true personality is insane, he's insane to the one he's obsessed. He will forever protect the one he loves.. Forever. But he keeps a poker face to the world, letting them see his "good" side. He's twisted, a man full of wealth and power. He's rich, intelligent, and a sociapath.