Source: comicvine.gamespot.com
Dr. Phosphorus
Yay, burning skeleton man! Batman doesn’t fight enough burning skeleton men. But that would change if people would finally start taking my advice and using Doctor Phosphorus more.
Dr. Alex Sartorious was too close to a reactor core breach, which sent five million slivers of radioactive sand shooting straight into his body. The radioactivity caused every atom of sand in his body to be boosted up one proton, turning them into phosphorus. Please read that sentence to literally any scientist. And then watch them laugh at you. Because they will. Hard.
Phosphorus blamed Batman for his predicament, because plot, and decided to get his revenge by burn-murdering him. He is also now a flaming skeleton man; did I mention that?
If he looks familiar, its probably because Batman: Beyond took visual inspiration from him for their big bad villain Blight. So if you like him, you have Dr. Phosphorus to thank for coming first.

