Sopo is a term used when you are playing as ice climbers without nana. In order for this to be possible you need to make nana commit suicide. Project m managed to find a way to get rid of nana right off the bat by holding R. how is this possible?
What ? Is this the only way to play as ice climber ?
Project M just used a code for that-- that's all.
Sopo's just a separate character ID already in the game.
You could alternatively also replace the MDL0 of Nana with an MDL0 that is only a single vertex, and remove all her hurtboxes and hitboxes, and that would also work; but if you're not bad at code edits, it's heckalot easier to do just that, like Lillith said