I would be some sort of cyberpunk type character that started out as a disenfranchised person like The Joker, but later turns into a mass murdering psychopath.
I would look like Psycho Mantis
replace the gas mask with an HMD and the suit with a house robe and you have me
My super powers would be based on nano technology and electromagnetism, I'd have telekensis and mind control capabilities and could send my consciousness into any electronic device and take control of the entire grid across the planet.
