If you liked
Suzumiya Haruhi no Shoushitsu
|
...then you might like
Steins;Gate Movie: Fuka Ryouiki no Déjà vu
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The main protagonists of both films have to deal with someone who is very important to them seemingly erased from existance. They must find a way to bring this person back. (To watch each film you need to watch it's prequel series or it won't make sense).
If you liked
One Punch Man
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...then you might like
Sakamoto desu ga?
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The main characters of both anime are way too overpowered in their own environment. Everyone around them struggles to keep up but completely fails due to their excellence. Both Saitama and Sakamoto think nothing of their "perfection", they can never seem to impress themselves no matter how amazing what they just did really was, likely they are used to being the best and simply don't care anymore. The two anime have very different settings and supporting characters but the similarities of the MC's definitely make them similar at least in that way.