Marui

"You got it, Boss. Watch the blender, I'll be right back." Pressing the button to chop the ice, Marui runs off down the hall to the mess hall, only to reappear a minute or two later with a cup of mysterious green sludge. Then it's a matter of adding the sludge to the crushed ice in the blender, adding a few more things from his table, running the blender a few more seconds and voila, matcha slushie. He dumps a bit into his own cup, giving it a taste test before pouring a cup for Tezuka and passing it over.

"Not half-bad for a first try. It'd taste real good with a shot of vanilla rum, bartender's recommendation."