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It feels so odd that Brendan and Lucas were never properly featured in the anime beyond movie cameos. May was Norman's kid in the anime, which would make Birch's kid Brendan. You'd think that somewhere in the series, Birch would say "I've got a kid who's a pretty strong Trainer, maybe you'll meet him out there!". Though Ash pretty much is the stand-in for every male protagonist.
Then you have the whole Gen II protagonist confusion
Kenta/Jimmy in the Raikou special who had a major role
Hibiki/Ethan in the Zoroark movie who was just a cameo, and separate from Kenta/Hibiki
It almost makes me wonder if Ash has a Gen III Red counterpart out there, or maybe even a Gen VII Red as Sun & Moon progresses.