AOT actor au headcanon!!!
• Gabi and Reiner are related in real life, but they're also related to... surprise!! Sasha. Apparently, they have an old uncle sometimes removed in common, to which his last name got transformed/morphed and that's why their last names are so alike, one is technically a variation of the other.
• Falco, Udo and Zophia also play as young Reiner, Bertholdt and Annie in every flashback, they got CGId/edited/photoshopped to look like them.
• Marcel is played by Porco's twin younger cousins, and one of them also performs as him in the flashback episode.
• Baby Eren is Carla's real life baby.
• Child Eren (from season 2 onward, I don't remember how many scenes of child Eren are after season 1, that's why I'm saying from season 2) is Eren Kruger's in real life son.
• Child Eren, Mikasa and Armin from season 1 are themselves but younger; after doing their auditions, production put together some preliminar scenario and stuff to see how'd they act together and to test everything, it was so good they left the scenes as they were and edited things once the serie aired.
• Kaya and Historia's daughter are related.
• Child Ymir (freckles) is related to Eren.
• Martin and Sunny are Connie's real life siblings; Ragako's arc got him really sentimental (Bert and Reiner consoled him after shooting that scene)