Board Thread:Young Justice News/@comment-47881-20170425164551/@comment-1038387-20170428151232

The Outsiders were a team formed by Batman when he couldn't see eye to eye with Superman. There were several incarnations since, including the one you mentioned, and there were several crossovers with the Teen Titans, like Graduation Day and The Insiders. Unlikely they'll go to the latter for inspiration.

The Outsider is a character that goes back even further: he was originally a disfigured Alfred Pennyworth.