Silent, curious, unreadable, worldly.
Serene is an observer which basically means that she spends most of her time watching and diagnosing other people. She's not an unkind person, but she's not openly kind person either. She's just sort of...there. A shadow lurking mysteriously where you don't expect her. She's not really afraid of any emotion, but seems very passive about them. She's not the kind of person who just talks about her feeling, but more just keeps herself with a calm demeanor and let's the world pass her by.
Serene has a belt that she always carries around her waist that is full of ornate throwing daggers (not that these daggers can't be used for just regular stabbing as well.) She also has one sword (a claymore) that she occasionally carries on her back and her forte is close-range, offensive fighter (which puts her at a disadvantage when fighting a long-range attacker) but she managed to survive with her dagger throwing skills.
Serene was born in a happy family with a happy mother and a happy father and a happy older brother. But one dastardly night, a lamp tipped over in their small, happy wooden house. Not so happy anymore, eh? The whole place burst up into flames, which inevitably killed the rest of her family. Serene doesn't like to talk about this incident, and when camping out she always sits a safe distance away from the fire, for reasons that none of her comrades may ever know.