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Pre-Crisis continuity: He felt he had outgrown the role and that Robin belonged with Batman but since Dick was pretty much out of Gotham and hanging around the Titans, he decided to pass the mantle to Jason Todd. It was a peaceful transition and Batman was okay with it.
Post-Crisis: He didn't quit, he was fired.
He quit being Nightwing because Bruce died and there was no Batman in Gotham. Villains and criminals had a field day terrorizing the city since Batman wasn't around. Realizing Gotham needed it's protector, Dick took over the mantle of Batman and gave up on being Nightwing.
What else can I help you with?
What were Dick Grayson's parents's names?
John and Mary Grayson
What is the secret identity of robin?
Dick Grayson was the original Robin .
What is Batman last name?
While it is never explicitly stated, there are several clues pointing to his last name being "Grayson".
Is dick Grayson in static shock?
Umm, no. He will be in his own book returning as Nightwing come the relaunch.
What is nightwings real name?
Richard John "Dick" Grayson became Nightwing after a falling out with Bruce Wayne.
When was Dick Grayson created?
Dick Grayson was created in 1940.
Which superhero was really named Dick Grayson?
Pretty sure it was Robinimproved:-Yup, Dick Grayson is robin. :)
What were Dick Grayson's parents's names?
John and Mary Grayson
What is the name of Dick Grayson's brother in Batman Forever?
Mitchell Grayson.
What superhero was dick grayson?
Dick Grayson does not actually have any superpowers, he was the original Robin and latter became Nightwing and then Batman.
Who is the best robin?
Dick Grayson
Is Dick Grayson the new Batman?
Yes
Who was batman's buddy?
Robin (Dick Grayson) .
Is Dick grayson male or female?
Female
What is robins full name from Batman?
Richard John "Dick" Grayson
Who is robin but now night wing?
Dick Grayson
Who does dick Grayson marry?
It doesn't seem likely.
