Jason Todd

Jason Todd was the first Robin and later became the Joker, Arkham Knight, and Red Hood.

Appearance
Jason had medium-length brown hair and striking blue eyes. His skin was fair but on the pale side. He wore the grey body armor an cape the Batman created for him.

Becoming Robin
Jason Todd was a police officer and a good friend to Bruce Wayne. When Jason discovered that Bruce was Batman, Jason was recruited as his sidekick Robin.

Becoming Joker
They went on many missions, but when they were tracking the Joker, Jason was taken by Joker into a shack and shot and beaten with a crowbar, resulting in him almost dying and his teeth being knocked out. Joker faked both of their deaths and took Jason to a warehouse lab. Joker tattooed crude markings onto him and gave him metal teeth. He slowly drove Jason mad and tinted his skin white and died his hair green. Jason became an insane psychopath that was surly against Batman- the new Joker. However, Jason remembered how he got there, and when he got into Arkham Asylum and grew close to Harleen Quinzel, he convinced her to take the fall for his "murder". She did and got sent to prison. Jason did this so he could keep living peacefully, and Joker would not go to prison so he could be brutally killed by Batman which was sort of revenge for Jason. He succeed.