JManM
Hold on... is the MC supposed to be another Grunt SI variant? For a supposed military otaku, he's acting more like a hypercompetent Gary Stu than, say, Kouta Hirano from HotD. Unless he's not as competent as he thinks he is? If that's the case, reality inevitably slapping him in the face should be funny. Kinda has happened already, what with showing off to the extent he did in school and assuming he'd still be in Team 8.
Really coming out of the gate there with Kiba killing a Jonin, possibly elite. I can see it because Zabuza was probably underestimating him. But who knows how power ranking works when it was possible for Itachi to reach Anbu rank and kill some of the Uchiha shinobi who may or may not have been Jonin