I'm low key dreading 18th gen because I've lost all trust in H!P to make any intelligent decisions with regards to MM. But of the current KSS these are the ones I think have a chance.
Miyakoshi Chihiro - 15 - Good dancer, and she has a unconventional look that I find quite striking (similar to early Harunan in vibe, but very different physically). Voice isn't so good. If they want a dancer, she'd be good.
Otsubo Mano - 14 - She's kind of average in terms of performance, but she's cute and confident on stage. If it's a large generation, I could see her being the "project girl"
Sugihara Meisa - 13 (turning 14 in Dec.) - Probably the most popular of the current KSS. Her dancing is good, and her singing is decent. She gives me a similar vibe to a young Maachan, but is already a better performer than she was at debut.
Ishikawa Hanano - 12 - of the properly young girls, she's the only one who I don't think would look totally out of place in MM (no shade to the rest, their just too smol right now). She's a strong dancer, and her voice shows potential too. That said, I don't particularly want any MM members under 14, I think any younger is just too young.
The only problem is they already dumped all the strong singers in random groups for no reason!! I hope they get someone really good from the audition.
MM ~ Nonaka Miki, Kaga Kaede ANGERME ~ Sasaki Rikako J=J ~ Takagi Sayuki, Danbara Ruru
CG ~ Yamaki Risa KF ~ Hamaura Ayano TF~ Kishimoto Yumeno
KSS - Takase Kurumi, Sato Hikari
OG ~ Iida Kaori, Suzuki Kanon, Fukuda Kanon, Inaba Manaka, Mitsui Aika, Nakajima Saki
Other Companies ~ Iwase Misaki, Cuca, Nagahama Neru, Maruyama Karin, Khao Kazumaisiri , Suzuka Nakamoto