Pretty sure 80% watched Pokémon as the first anime

Kochikame

dbz

Akira

Pokemon/Digimon

Technically "Pokemon," but that doesn't really count.
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After that I was going to say "Inuyasha," but I just realized it may well have been "Monster Rancher," which I had somehow failed to classify as an anime all this time for some reason

Doraemon

Ninja Scroll