Regarding the discussion of degrees kelvin: 0 K is -273.15 c or -459.67 f.
0 k is like, the platonic ideal of coldness. If a state of coldness lower than that exists, we don't know to begin to detect it.
Edit: n the topic of Smash... Honestly, with Sora getting into Smash ultimate I don't think I have any dream picks left. Maybe Razputin.