Odd one here, because the first thought that you'd likely have is "Just a normal guy... what's so great about that?"
Well, I have no idea if this was intentional or not, but Mifune from Binary Domain looks pretty strikingly like Shintaro Katsu (the actor who played my favorite movie character of all time, Zatoichi) during the later years of his life.
Hard to find a good picture of the late-1980s Katsu to compare with the character in the game (mostly just pictures from movies, where he's in-character), so I won't provide any, but anyone who has seen what Katsu looked like near the end of his life ought to recognize the similarities. The nose, the eyes, the shape of his face, the style of his hair, and the beard.
Even the frame of his body and his general height seem to be about the same.