idk where to put this but i think Miko works exceptionally well with two kinds of collab partners:
1) a person who can troll the fuck out of her without remorse (coco, fubuki)
2) a person who make an absolute clown of herself that even miko can jab on her (korone, momosuzu family, and recently ao)
suisei, and by extension the rest of shiraken, are usually boring collab partners because they commit to neither of these. they dont make fun of her enough or fail themselves enough. there's an irony that them being good friends only led to their lack of chemistry. (mio is also in this position)
on the opposite end, the reason why pekomiko works so well is because pekora is able to be both roles at a flip of a switch. Marine and Subaru can also do this, but their collabs are usually more sporadic and they can't balance both roles the same way pekora can.
watch the first 16 minutes of this stream. keep in mind this is the first time miko and ao formally collabed. unless my reps are lacking i don't think i've ever seen suisei made miko belly laugh this fast or frequently.
https://www.youtube.com/watch?v=JHeay1eEBswThe problem with micomet is neither in miko or suisei respectively. they're both great talkers in their own right. they just don't have the right chemistry together.