I got my first Pluvia from Swimsuit Mami's banner...

Before getting one of her, I've got all these characters from the 'generic' pool of megucas (keys, off-banner, etc.):

A5 Ren
A3 Homura
A2 Kaede
A2 Sana
A2 Tsuruno
A1 Oriko
A1 Kirika
A1 Momoko
A1 Iroha
Kyoko
Moemura
Mami
Yachiyo
Doppel Iroha
Mabs

The 34th time's the charm