[Autumn]

Sayakana is made of a metal, thus is only compatible with metal material changing kits, I think as a doll it should be made of cloth instead to be compatible with cloth material kits.

[Snake]

True, I found it weird too while I was trying to Snakescale it.

[Akame]

Yus, I agree. Makes more sense to be cloth.

[Exxy]

A bit off-topic but the Title is a little confusing, regardless I agree with the idea (also, it probably needs to be looked into what other previously-non-material items are affected this way as well).

+1

[Neus]

Okay.