1) Gotouge draws names fast, taking up to 1-2 days only to complete (compared to Oda 3-4 days and Sorachi 4-5 days)
2) Gotouge and the editor revised the things through phone and electronic fax
3) Inspiration for the work is Jojo (breathing styles and the undead/ghost)
4) Gotouge is a principled writer. When they don't want to change anything, they will persist in that, but when not related to principled issues, they will change things modestly. Then goes to follow about an example that Goutouge changed a thing after a suggestion (citing it is not easy to grab readers in the early days)
5) Gotouge planned to give up on the mangaka work in case Kimetsu wasn't serialized during 2015.
6) Tanjirou's design came up as a suggestion that his design as an ordinary guy should counter the more strange characters later on
7) Gotouge loves Gintama, and the comedy bits are inspired by it
8) Gotouge does not work for their enjoyment, but thinks about how to make the readers enjoy the manga
9) There is a rumor around that Kimetsu no Yaiba once didn't do well and was in a desperate situation, which was never true. In fact, the editor calls Kimetsu a "lottery win", which managed to get a Color Page for Chapter 7, suddenly decided out of nowhere because of the popularity.
10) Kimetsu has never paid attention to the Jump slogan "Friendship, Effort, Victory". The editor has never used this as a standard. The standard of the work was whether it can make the readers to find it interesting, and that was all.