I want to see G Idle Miyeon and IU have a duet because Miyeon's voice is so unique and perfect for duets and IU is the best ballad singer there is in my opinion. I also want to see The Boyz Hyunjae and EXO Baekhyun have a duet. Hyunjae because I love The Boyz and Hyunjae's vocals are so good and Baekhyun because he is the king of vocals.
On words of what I would like the performance to be, watch Pentagon x ONF's Kill This Love rendition on Road To Kingdom. That is exactly what I would like to see, and I think the people who could pull something like that off again would be:
Kino of Pentagon
Chungha
Joohoney of Monsta X
Seulgi of Red Velvet
Seungyeon of CLC
Momo (Twice)
Chungha
Lisa (Blackpink)
Seulgi (Red Velvet)
the four dancing queens of 3rd gen, just performing together.
it would be a revolution of multi group collabs
Ideally, I would still like to see a song collab between Taehyung and Minkyun because one of them has a unique deep velvety voice while the other has a unique high-tone lemon voice so I think the result would be pretty epic if they can arrange their vocals correctly.
Previously, I've also said that I've wanted a dance collab between J-Hope and Yuto but I've realized that their styles of dance are different so it'd be difficult to collab, so I think perhaps pairing him with Jimin would be better since their overall sense of grace and movement is somewhat similar.