 If you liked
World Trigger
|
 ...then you might like
Chaos Dragon: Sekiryuu Seneki
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Kuga (WT) and Ibiki (Chaos Dragon) looks very similar. However they act as opposites, their goal is pretty much the same.
Also, both anime's start off as light-Cute-Funny anime's. However, early on through the anime it begins to turn 'Dark'. Instead of your happy-cute-fun Anime, we have a hint that the anime isn't exactly all Fun & Games, and we begin to see the true colors of World Trigger.
Both MC's seek for revenge, for a fallen loved one.