Keiji Shinogi.

Keiji is shown to be pretty casual 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 and knows when to speak up and when to leave them be.

He's also encouraging and gentle with the younger participants, making it his job to at least keep watch over Gin.

In certain situations, Keiji's responses appear flirty to distract others and avoid answering, sometimes even to joke around. Evidence of this is during Russian Roulette when Sara asks why he trusts her so much, in which he replies that it's because she's cute. Another occasion is when Reko asks what Keiji and Sara are doing, he replies that the two are on a date.

If it wasn’t already obvious, he has feelings for Sara.