I've seen them all and enjoyed them all. Currently watching Arc-V as it airs. If anything, Zexal was my favorite, it grew on me a lot and eventually I just ended up loving every minute of it. Not sure how'd I rank the others, there really isn't that big of a gap between them for me. I'm sure Arc-V will end up being close with all of them.
Originally Posted by Nikkolas
Again, enjoyed them all. Yuma maybe. I enjoyed seeing his growth and his Kattobingu grew on me as well, and I just love his attitude to not lose faith in people no matter what. Again, they are all within the same range of me liking them.
Vector. This one I can actually say with certainty. He's basically all the things I like about villains rolled into one character. A lot of antagonists in Yugioh don't really stay antagonists, which I love since I love characters switching sides in whatever way it is, major or minor, usually minor in Yugioh but good enough for me.
I seen DM, GX, and 5D's in the dub first and enjoyed them, seen Zexal in Japanese first and enjoyed it. I've seen them in the opposite too, but each case was a matter of "This sounds weird", it grew on me in the end. Arc-V and Season 0 have no dub(Arc-V will though). Overall, I have no real preference. I am re-watching all the Yugioh episodes though(In Japanese), currently at like episode 60(Finished Season 0 though, and Arc-V is only at episode 10 now) for them all or something around there.
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