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In the comics, Robin was the leader, and remained leader after becoming Nightwing.
Nightwing (Dick Grayson) is a person who was once Robin. Nightwing was the first Robin, Dick Grayson. When he became Nightwing, the spot of Robin was taken over by Tim Drake. Therefore, Nightwing and Robin are the same people.
No. Robin does turn into Nightwing, but not because he is bad. Nightwing is still an ally of Batman.
No. Nightwing is the original Robin when he was older
Dick Grayson is Nightwing. He protects the city of Bludhaven.
No, neither Nightwing nor Batgirl have children.
Nightwing
In the teen titans, you see robin in the future in episode "how long is forever", but other than that they don't show Nightwing.
No and the first robin was called nightwing
no, but Nightwing is
No, he used to be Robin the sidekick of the Batman
Nightwing (He was also the first Robin) Dick Grayson is the real name of Bruce Wayne's ward. Bruce is of course Batman, and Dick is Robin.