I have an obsession with Batfam meets the Justice League fics and headcanons in general, and my favorite situation is when the JL fully knows Nightwing, he's on the team, they all like him quite a bit, and he's so charming and open seeming that they all collectively forget that they don't know anything about him.
I want that, then on a mission, fighting a magic user of some sort, Nightwing gets zapped back to young Robin age. So everyone else on said mission is left confronted with 9 year old Dick Grayson in full Robin gear, who is fully ready to fight every single one of them, and they generally have no idea what's happening or who this child is, other than the fact that he's probably young Nightwing, except he won't answer to that name.
And Dick, extremely confused and suspicious because he doesn't know half of the people there, and the ones that he is aware of are wearing different costumes or are just straight up different people than they're supposed to be, proceeds to try and fight them, then actively try to run away.
Then they finally manage to wrangle him back to the Watchtower, trying to grapple with the implications that Nightwing has been a highly trained, costume vigilante since childhood, and managed to break a bone in Green Arrow's hand before they subdued him, and is still thrashing around and trying to bite various League members.
They call Batman, Superman, and Wonder Woman in to see if they have any idea what to do with him, and when Robin sees Batman, he squirms out of Flash's grasp, runs to Batman, and climbs up his side until he's wrapped himself around his shoulders like he does it every day.
The Bat lets this happen, sighs in exasperation, then calls Zatanna to help.
The League is then left to piece together why tiny child Nightwing ran to Batman for safety, and why Batman seems a whole lot less confused than everyone else.
