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I'm still thinking about fake talon!Peter but I'm also filled with other stuff that could or could not happen. Anyways, wasn't Peter 6 years old when his parent's died, right? (It also says he could have been 4. Man, idk. Comics recon certain events and it sucks keeping track.) I always wondered in the Dick is Richard Parker scenarios if he ever called Peter "Robin." It wouldn't be out of place imo and it may parallel the passing of the Robin title in that dimension.
Let's say that Richard did call him Robin enough times for Peter to sorta remember. It will be extremely nostalgic for him when he arrives to Gotham and hears a kid/teen vigilante with his childhood nickname. Later on if he ever partners with Batman, Bruce is the one hit with the nostalgia because dimensional grandson really does take after his father huh.
Jason in the corner just being snarky and asking if he's displaying signs of dementia when Bruce accidentally called Peter Robin after a particular risky mission. Batman totally doesn't want a redo of the first Robin run.