If you liked
Katekyou Hitman Reborn!
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...then you might like
Phantom: Requiem for the Phantom
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Katekyo Hitman Reborn portrays mafia, hitman, comedy, supernatural, and action in the story genre. While Phantom has the mafia/hitman quality, the series has almost little to no comedy with a huge amount drama/tragedy. I would only recommend the two if you are into the mafia type anime, even though both series are excellent!
Huge difference between the two series is the main characters. Tsuna from Katekyo Hitman Reborn appears weak and hopeless many times throughout the show. On the other hand Zwie from Phantom Requiem appears cool, strong, and cold-hearted = the perfect hitman.