Kyouji, known as "Mysterious Man", is a party member in the Yahigashi Building. He kills the enemies by himself with Shuffler and Maragion with no input from the player during this dungeon. He is technically considered a demon during this dungeon.
Abayo was originally Takashi's catchphrase earlier in development, but was changed into Kyouji's catchphrase to have the plot of Rei noticing Takashi's possession make more sense.[4]
↑"見た目は普通のおじさんだが、実は彼の肉体にはデビルサマナーである葛葉キョウジの魂が乗り移っている。" Persona World Guidance (2001), CB's Project. Published by SoftBank. Japanese. p. 62. ISBN-13: 978-4-7973-1498-4.
↑"岡田 そこも迷ったところなんだよね。ある程度気づいてもらわないといけないし。でもセリフで苦労したのは、タカシにサマナーの魂が乗り移っているのをレイが気づくというシーンなんです。サマナーの口癖で、それと気づかせようとしたけれど、なかなかイキなのができなくて。実は、「あばよ、あばよ」って口癖はタカシのものだったんですが、急遽これをサマナーの口癖にしようとマスターぎりぎりになって、全部「あばよ」を入れ替え。スケジュール的にも大変でしたね。" Translation: "Okada: We were also a little lost there. You do have to notice somehow; we had trouble with the lines when Rei noticed Takashi’s soul was taken over. We wanted to make it noticeable due to the summoner’s way of talking, but it was too particular and we couldn’t do it. In truth, “See ya, see ya” was Takashi’s stock phrase, but we decided to turn it into the summoner’s stock phrase and then added it everywhere. It was difficult schedule wise too." Shin Megami Tensei: Devil Summoner Official Guidebook Final (1996), JK Voice. Published by Aspect. Japanese. p. 116. Translation by dijeh. ISBN-13: 978-4-89366-472-3.