Hey I think I might have found something new, tell me if you guys have done this before
If you jump, land, and then jump again (but I don't think this works if you do the second jump frame perfectly, the ICs have to be SLIGHTLY out of sync... I think?), then shoot ice blocks, but before the 6 frames later when nana swings her hammer, you press in the opposite direction on the control stick. Nana will swing her hammer in the opposite direction of popo.
The ice blocks still go together in front of you, and nana still lands facing forwards, but the little hammer hitbox of the ice blocks covers you on both sides when you do it, and it's not very hard to do.
Maybe the most useless new tech ever? I can't find anything on google about it