Tokita is the most annoying character. He's uncommunicative, pointlessly hostile and condescendingly tries to play the role of the martyr.
(I'm not really convinced it'd be that easy to manipulate people, even highschoolers, but I can let that slide for the sake of the story I guess)
I WILL SAVE YOU WITH MY THROWING KNIFE! THIS SURELY CANNOT BACKFIRE!
It is a pretty interesting concept. Even without 'Irises', people have been unable to properly use what they can perceive as well as they'd like for all of human existence.