For me, it’s giving keys to

Jiggu
Karina
Kayou
Sparrow
Nia
Tok
Koishi
Stena
Gyro
Caelestis
Shiro
Nyll
Minette
Zero
Renee
Machi
Buelle
Ceobe
Skelly
Rumlatte
Reitaisai
Ellie
Talyhn
Raimu