
Shiori Usami
She is an Operator and a member of Border's Tamakoma Branch, serving as the Operator of Tamakoma First and Tamakoma Second, being originally a member of Kazama Unit, and also serves as an Operator for YĆ«ichi Jin despite (or due to) the fact he's a solo agent. She is also the creator of the "Yashamaru Series".
(Source: World Trigger Wiki)
(Source: World Trigger Wiki)