Santa Nero from FGO
The original Padoru
Has a bunch of other anime girls imitating her.
Chibi anime girl
Constantly sings Padoru
Spins constantly
Hides in weird locations to ambush you.
Will break into your house to sing carols.
always filled with Christmas cheer.
Can change into alternate Padoru forms with their own personality.
Padoru Alter is a grumpy tsundere. Padoru Santa Lily is a cute but bratty little girl. Mysterious Padoru X wants to hunt down the other Padorus.