Age: Depends on story, it can be 200+ or 15.
She a good demon.
Personality: She may look like a person to be enthusiastic and pure, but she's shy around everyone and she's really, really cute.
Crush: Depends on what I make her backstory. I have one for Zenitsu and I have one for Kanao. Also, one for Mitsuri. I use the Mitsuri one 1% of the time, Kanao 93%, and Zenitsu 6%. I'm starting to use Genya, now.