Who am I? By Annabelle

I have pale white skin and short black hair. I can float anywhere and when I do, I hide myself in my dark cloak.

I work in a super hero team and live in a T-shaped tower with all my blinds shut in my deep dark room.

I am a gloomy, sarcastic and private person. In my free time, I like to meditate and read but for work, I am out fighting supervillans.

Who am I?