After messing around with the de-synchs I came up with something I've never seen to keep their actions separated.
The taunts
Although it's worse to have one ice climber only while the other taunts, this might have a positive side after all. Maybe you could use popo to taunt while nana does some safe attacks without risking taking damage. Another thing that came to mind was to approach by the air while nana covers the ground with ice blocks, this doesn't seem to work because nana does nothing. Another possible thing is to split them and brutally surround the enemy with something, anything.
Sorry if this was already mentioned or discussed; I am currently an IC beginner afterall.
The taunts
Although it's worse to have one ice climber only while the other taunts, this might have a positive side after all. Maybe you could use popo to taunt while nana does some safe attacks without risking taking damage. Another thing that came to mind was to approach by the air while nana covers the ground with ice blocks, this doesn't seem to work because nana does nothing. Another possible thing is to split them and brutally surround the enemy with something, anything.
Sorry if this was already mentioned or discussed; I am currently an IC beginner afterall.