Charlottes
DxD is memorable for a lot of things the ecchi, hot girls, the setting, and the dumb af protagonist. Love him or hate him Issei is a core part of what makes DxD tick. Imagine a DxD with a generic isekai protagonist would be way more boring cause then it become predictable, or a protagonist like say Ichigo or Natsu then we get typical shonen tropes. Its an ecchi anime so a perv*t as a protagonist is kinda expected. I’m not blasting you for hating Issei but he kinda helps drive the series. I dunno just my two cents.
Charlottes:What? I don't understand.
Hey author if you do make a DxD cross over there is one thing you can do that I have seen another author do. He made it to where Issei had a twin sister and gave her the Boosted gear instead but she cross dressed because she was always around the perverts her thoughts it was natural only for later on the FFs Mc to fix her behavior and help her improve.