Ratsuwan Kaikei is the young merchant's friend in the Maoyu franchise.
Ratsuwan Kaikei is originally created by Mamare Touno and illustrated by Keinojou Mizutama & toi8 for the Maoyu light novel series. There is no current information regarding any inspirations used to create this character. He is illustrated by Hiro Touge in Maoyū Maō Yūsha: Oka no Mukō e manga series, by Akira Ishida in Maoyū Maō Yūsha: "Kono Watashi no Mono to Nare, Yūsha yo" "Kotowaru!" manga series, and by Hiroaki Karasu & Masashi Kudo in the anime series. He first appears in episode 1. He is voiced by Shinnosuke Tachibana.