The Empress of the Inazuma region is an electro character and before unleashing thunder on the enemy you will first need to upgrade the Shogun a little. Here is the complete list of the materials needed for Raiden Shogun.
Raiden Shogun Ascension Materials
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
Amakumo fruit
Number required: 168
Old Handguard
Number required: 18
Kageuchi Handguard
Number required: 30
Famed Handguard
Number required: 36
Raiden Shogun Talents Upgrade Materials List
Old Handguard
Number required: 18
Kageuchi Handguard
Number required: 66
Famed Handguard
Number required: 93
Teachings Of Light
Number required: 9
Guide To Light
Number required: 63
Philosophies Of Light
Number required: 114
Molten Moment
Number required: 18
Crown of Insight
Number required: 3
Five star characters aren't always the best and Sayu just proves it once more with her performances during the Divine Ingenuity Event