Ichidō used to have a taller, thinner, and more rugged appearance in both of his beta designs.
Originally, the chapter 2 murder was going to be a double murder. Word of God states that they just couldn't decide on the killer, so they made one of the victims the new killer.
Word of Gay: Blue says that it's okay to headcanon characters as however the viewer sees it, but he personally sees everyone as in the LGBTQ community.
Blue also states that Tsukisae, Poruka, Daidai, Nao and Lorde are all canonically wlw and mlm respective to their gender.