The General of the Administrative Commission is an electro character and before unleashing thunder on the enemy you will first need to upgrade the General a little. Here is the complete list of the materials needed for Kujou Sara.

Vajrada Amethyst Sliver
Number required: 1

Vajrada Amethyst Fragment
Number required: 9

Vajrada Amethyst Chunk
Number required: 9

Vajrada Amethyst Gemstone
Number required: 6

Storm Bead
Number required: 46

Dendrobium
Number required: 168

Damaged Mask
Number required: 18

Stained Mask
Number required: 30

Ominous Mask
Number required: 36
Kujou Sara Talents Upgrade Materials List

Damaged Mask
Number required: 18

Stained Mask
Number required: 66

Ominous Mask
Number required: 93

Teaching of elegance
Number required: 9

Guide of elegance
Number required: 63

Philosophy of elegance
Number required: 114

Ashen Heart
Number required: 18

Crown of Insight
Number required: 3

If you're looking to upgrade your characters in Genshin Impact some of them will require Onikabuto and here where to find them