If you liked
Chikyuu Bouei Kigyou Dai-Guard
|
...then you might like
Samurai Flamenco
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Both feature hot-blooded hero characters trying to protect justice in a world that with realistic physics and without superpowers that run on passion.
If you liked
Digimon Adventure
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...then you might like
Heroman
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Both feature a young protagonist with a very limited wardrobe and a powerful partner whom they support via a small handheld device. Also, they both offer relatively light-hearted Saturday-morning-style action.
If you liked
Koko wa Green Wood
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...then you might like
Zettai Karen Children
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Both mangas take time torturing their hardworking male leads through multiple years. They do this for the sake of building up awesome "F**k yeah, Minamoto/Hasukawa!" moments of triumph in the latter part of the series.
If you liked
Daa! Daa! Daa!
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...then you might like
Beelzebub
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Both manga are comedies involving students forced to take care of a baby with supernatural powers.
If you liked
Akagi: Yami ni Oritatta Tensai
|
...then you might like
Gamble Fish
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The protagonist is a genius teenager who has little to no regard for his own life as he bets it against vast sums of money. Also, mindgames.
If you liked
Mx0
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...then you might like
GS Mikami: Gokuraku Daisakusen!!
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Both feature a powerless male lead who's surrounded by power users. Though both Yokoshima and Kuzumi are in way over their heads, they survive through a hilarious combination of blind luck and bluffing.
If you liked
Gantz
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...then you might like
Eden no Ori
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Both involve people in their teens being tossed into a life-or-death situation where the normal rules of society no longer apply.
If you liked
Tobaku Mokushiroku Kaiji
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...then you might like
Metro Survive
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Kaiji and Metro Survive both put normally stifled and weak everymen into do-or-die situations which allow their character to shine. Also, there is a lot of "heartlessness for the sake of survival" in both.
If you liked
Bouken Ou Beet
|
...then you might like
Ueki no Housoku
|
Though they differ significantly in time and place, they share two key aspects: the selflessness of the main character and the creativity of the fight scenes. Ueki, like Beet, was saved from death by those he grew to idolize not once, but twice. And the powers they have are not used to brute-force fights, but to win them creatively (such as in the fight with Grineed or with Bolo T).
If you liked
Ueki no Housoku
|
...then you might like
Kekkaishi
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Both involve creative superpowers and consequently the best battles ever. Since the nature of the hero's powers in both series basically precludes any chance of just using raw power to win a fight, their winning plans always come out of left field and are always a surprise.
If you liked
Hajime no Ippo
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...then you might like
Dragon Voice
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Although one is about singing and the other is about boxing, both series share a strong sense of passionate competition, which is reinforced by the friendships within both the Beatmen and the Kamogawa troop. Also, every main character/boxer in HnI, even the clown prince Aoki and street punk Sendo, gets developed in ways that actually make you feel for him. I got similar feelings reading DV with Goh and Toshi, as they started out as secondary characters until we got a look into their respective family situations.