Suiko Tatsunagi

Suiko is a character in Cardfight!! Vanguard. She is the eldest sister of Rekka and Kourin. She helps them run the cardshop PSY, and is a member of Team Ultra-Rare. In PSY, she handed Aichi King Of Knights, Alfred. She seems always calm and settled as a facilitator.

(Source: Cardfight!! wikia)