M-flo Loves Ayu would be great
I don't know if Ayu/Utada or Ayu/Namie would be good, I don't think the end result would be good. it would be interesting
out of real collaborations , I like LISA/Koda Kumi and Ken Hirai/AI and Ken Hirai/LISA. a lot of the M-flo Loves collabs are also awesome. I loved the Suite Chic project by Namie a lot too which was basically a collaboration project by Namie.