I swear that masked chuuni Yamada always irks me. Being deluded is already bad enough, being stupid as well exponentially increases how annoying that (presumably) kid is.
Not just Chuuni, that guy is murderer. He doesn't hesitate to kill innocent people.
He has gotten in the way of MC many times, and it is annoying as hell. He's not like team rocket either, where although they get annoying, it doesn't get in the way. This guy gets in the way too many times that it is annoying. He will also never die, because author will never make MC kill him or anyone.
I remember Before this yamada guy introduced, we have 8.40 Rating,
Now this time fell 7,30, Many readers hate him,
Wrong move from author introducing this little shit