If you liked
Death Note
|
...then you might like
Code Geass: Hangyaku no Lelouch
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Light "Kira" Yagami and Lelouch "Zero" Lamperouge are very similar characters. Both of them have genius intellects, a supernatural ability with very specific limitations, and a desire to change the world under a false name. In terms of differences, Code Geass is more fast-paced, and since it is set in a world with giant robots, there are plenty of large-scale action scenes - Lelouch's strategic genius is always pivotal here. It does, however, has fewer mindgames than Death Note - there is no L figure, though there is an "Athrun Zala figure". Lelouch is less fully evil than Light, with more clear motivations for his acts. Interestingly, he regards himself as a monster while Light regards himself as above morality.
If you liked
Mushrambo
|
...then you might like
Tengen Toppa Gurren Lagann
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Similar adventurous themes, as well as [spoiler]combining[/spoiler]
If you liked
Shaman King
|
...then you might like
Fate/stay night
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Fate-stay night has a number of similarities to Shaman King, but as a seinen series is overall darker and more character-focused. Magic takes on a larger role in F/SN than Shaman King. Both series revolve around a tournament fought with spirit allies over an incredible power.