Kamisato Ayato 
The young but highly accomplished head of the Yashiro Commission's Kamisato Clan. Cultured and polite, he is a man of many ways and means.
Consteallations
Kyouka Fuushi
Shunsuiken DMG is increased by 40% against opponents with 50% HP or less.
World Source
Namisen's maximum stack count is increased to 5. When Kamisato Ayato has at least 3 Namisen stacks, his Max HP is increased by 50%.
To Admire the Flowers
Increases the Level of Kamisato Art: Kyouka by 3. Maximum upgrade level is 15.
Endless Flow
After using Kamisato Art: Suiyuu, all nearby party members will have 15% increased Normal Attack SPD for 15s.
Bansui Ichiro
https://wiki.hoyolab.com/pc/genshin/entry/31
Boundless Origin
After using Kamisato Art: Kyouka, Ayato's next Shunsuiken attack will create 2 extra Shunsuiken strikes when they hit opponents, each one dealing 450% of Ayato's ATK as DMG. Both these Shunsuiken attacks will not be affected by Namisen.