 If you liked
Bakugan Battle Brawlers: Gundalian Invaders
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 ...then you might like
Cardfight!! Vanguard
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Cardfight!! Vanguard is obviously another Card game Anime.
Shounen series, many episodes, whole bunch of characters, for a young audience, full of fights, Bonds between friends and their cards/monsters, the English dub sucks, with a cute cast of females, too!
And as shounen it may be, it's fit for both females and males to watch.
The Protagonists however have many differences, but CF!!V does have Kai Toshiki who's similar to Shun in a few ways and give off a slightly similar vibe, what one would call a "Kuudere".
If you like this, you'll like the other, just like Bakugan, CF!!V also has a real life version of the card
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