Yuri is on bass, hence she's Mio - quiet, pretty, and grumpy. I can see Masaki as Ritsu and Mako as Tsumugi. Easily. Then we come to Tomoko as Yui. Useless older sister, maybe? Clumsy and shy at first? If Tomoko met Yui "God, that girl is the most annoying human ever created - and what was with her raping that little twintail bitch in the club room?" "Ritsu, who was that mean girl?"