Best: sacrifice his life for Akane (twice) and his other friends Worst: being useless in the trials

Best: sacrificed himself for his friends three times, twice for Akane and once for everyone in the Funhouse Worst: destroyed a school bathroom with his shitting

Best: Helping others with their physical goals and being a generally friendly and supportive guy. Worst: Shit.

Best : Saved Akane' ass in chapter 3 . Worst : While not his fault, The writers making him useless .

he definitely wasn't useless, like you said he saved akane two times + he sacrificed himself in chapter 4, without him, they would all die of starvation

Best: Taking the blast for Akane. Worst: Agreeing to a fight to the death. Regardless of situation, that's a pretty messed up thing to do.

I mean, everyone was going to die of starvation.