Bruce has a strict 'no metas/powers (except duke) allowed in Gotham' policy in place but it has a clause, BYOR (Bring Your Own Robin)
No one is allowed entry untill and unless they can produce their very own certified robin-shaped identity card
Whenever someone with even a hint of supernatural powers in them arrives at Gotham, they're first met with Bruce standing at the city border with a notepad in hand
Bruce: State your name and purpose.
Kon: Kon-el, here to hangout!
Kon, flourishing Tim from behind him: Ta-Da!
Bruce: Approved, you may enter
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Hal: Here to investigate a case, Hal Jordan
Hal: I.... don't have one?
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Bruce: Yes, Wally, where's your robin?
Wally: Oh shit lemme just- *zaps away and returns with Dick, who was in the midst of brushing his teeth, in a bridal carry*- Here!
Bruce, grumbling a little: Fine. Approved.
Dick: You gotta stop using me as a key already, man
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Clark: Clark Kent, here for our monthly barbecue
Clark, producing an actual robin bird: Does this count?