User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-30924344-20171117215420

@B214 About the Juzo thing; I have here the kanji description of him and my translation for you to check:

イッセーの父方の祖父. 故人でありイッセーの独白に登場する「天国のじいちゃん」. 第一印象が「エロい」と いうほどスケベな人物で、イッセーの性癖の根幹を作り上げたともいえる存在. かなり高齢になっても若い女性 をよく目で追っていたらしく、イッセーの父は隠し子が出てくるのではないかと心配していた時期があったほど.

仏教徒だったため死後は極楽へ迎え入れられ、現在では「赤龍帝の祖父」ということで一躍有名人になっている. 雲外鏡の力でイッセーと再会を果たした後、タナトス戦でオーフィスと釈迦如来の力を借りて神器の中からイ ッセーをサポートし2つの新たな乳技を開眼させた. 勝手に神器に侵入して好きにシステムを組み替えるという フリーダムさにより、ドライグは泣きが入るほどに混乱させた.

My translation -

The first impression is a person who is as scary as "erotic" (so all the males of the Hyoudou family are perverts lol) and it can be said that he made up the essentials of Issei's sexual habit. Even when he had gotten older, he seems to have often followed young women, causing Issei's father to have been worried that a secret child would come out. Because he was a Buddhist, he was welcomed into paradise [buddhist heaven] after death, and is a celebrity because he is the grandfather of the Red Dragon Emperor [he must be real proud his pervertedness influenced Issei lol].

After fulfilling the reunion with Issei by the power of the outer cloud, in the fight against Thanatos, he borrowed the power of Guanyin and Gautama Buddha to support Issei and opened up two new breast techniques [so Issei has 3 now]; Gautama aka The Buddha sent his conscious to assist Issei and Guanyin arrived personally to help Issei.