Im so sorry I forgot I have alterspring. Id day the possibility of this being a recurring collab is very high, this one was pretty successful, based on reception of cards and 2dmvs. tsukasas bnd got mil views in 4 days isnt it crazy. kanade is right behind with 800k and, most shocking to me at least, yoidore is half a million views in just three days – very rare thing to happen with vs 2dmv. And this collab is pretty easy to do as well since theres less hassle with rights and negotiations about branding, its literally just song themed card. Extremely fitting for a vocaloid game too. Id expect them to make a round 2 with next batch of charatcers and maybe rerun of this banner next year. I think theyll skip one unit, as they did with mmj here.

If I were to guess which songs other gonna do. They take songs that are in hall of fame and they arent limiting themselves to just old classics (shadow shadow released 4 years ago), and they need to have 3dmv and alt for character. So from that

Saki – Ikanaide, Time Machine also a possibility
Honami - Umiyuri Kaitentan, Kaisei
Shiho - Lost One's Weeping, Tokyo Teddy Bear (ttb also possible for Saki actually since she can be made to look like rin. Alternative for shiho is hello worker which is ijbol)

Minori - wow she has pittance about of alts for 3dmvs. 90% probability shes gonna get vampire. Which is absolutely tragic
Haruka - Near, Shoujo Rei
Airi - dreamin chuchu is now a possibility. Kimagure Mercy is more likely

Kohane - drop pop candy
Akito - for the sake of humanity I hope he gets Fragile or Brain Revolution Girl if Toya gets Fragile and not the genshin impact albedo scaramouche heizo dancing music
Toya - more likely to get Fragile. Can also probably get Rumor

Emu - sweet magic, dance robot dance also possible. But the only correct choise is all the things I need
Nene - same as emu but I also think she can either get kami no manimani (esp since story of amaterasu is similar to nene) or living millennium which would be the best card in the whole game
Rui - id say he locked oki ni mesu mama. He's also strong contender for rabuka as he is the local hazbin hotelesque customer bait

Mafuyu - butter choco decoration
Ena - good answer is Charles bad asnwer is aishite
Mizuki - villain i guess

For vocaloids, since they did unit vs and meiko is vbs starter i think
Miku - niigo miku and shes getting phony
Rin - if its mmj rin she has to get vampire instead of minori, because she doesn't have any mmj 3dmv alts. If its not mmj rin it has to be niigo rin with envy baby, because rin has only 2 alts for 3dmvs unless they give something else
Len - vbs len doesnt have a vbs 3dmv cover alt. Unless they give him one in future its either going to be ln len with roki (highly probable) or niigo len with Charles (least probable)
Luka - ln luka with teo
Kaito - wxs kaito has zero wxs 3dmv alts. Either he gets one or vbs kaito saves the pups grom ifuudoudou. We can also get niigo kaito phony