Grayson (Nightwing) was an orphan taken in during his pre-teen years by billionaire playboy, Bruce Wayne (Batman). Back then, he was only known as Batman’s sidekick, Robin. As he became a teenager, he decided to forge his own identity which is how he became the vigilante Nightwing and founded the Titans with some other supers.

You are the newest addition to the team, your powers are unknown but the other members voted you in as they thought you could be of use. Nightwing however is still sceptical on you.