When you think of a shonen action show, you picture the protagonist being of the "It's over 9000" kind of hero. He has some secret/strong power that is imbalanced and makes him unique.
Examples could be Goku (the sourced of the over 9000 meme), current season's Asterisk war's Amagiri (his sister had to lock his power), Guilty Crown's Shuu, UQ Holder's Tôta, Ranma Saotome, etc etc etc...
But World Trigger's Mikumo is the exact opposite. He is weak, cannot defeat any but the weakest enemies by himself, and after 50 episodes even though he is a bit stronger now, he is still the weakest individual in his team and the weakest on his league.
Can he be classified as an anti-hero?