There are 4 types of chuubas imo:
You can place some chuubas in more than 1 category or other categorys, What do you think

Funny
Fubuki
Haachama
Subaru
Pekora
Coco
Polka
Kiara

Chill
Susei (shes top tier, can place anywhere)
Mio
Okayu
Flare
Towa
Watame
Botan
Ina
Calli

Cute
Sora
Elite Miko
Roboco
Ayame
Shion
Rushia
Kanata
Nene
Gura

Sexy
Matsuri
Mel
Choco
Aki
Marine
Noel
Lamy

Idk where to place Aqua