Keiji is shown to be pretty laid-back and level-headed during the Death Game, though he comes off as shady to some of the participants. He usually refers to himself as "the friendly policeman" in an effort to establish himself as trustworthy, and makes a pretense of being less cunning than he really is. 

He's observant, canny, and is quite good at reading other people. He has good instincts regarding when to speak up and when to remain quiet.