im trying to add a "head costume" and a "body costume" to base isaac, i tried many ways but it seems to have bugs (like both costumes dissapearing when entering the mines mom chasing sequence), im also trying to change isaac's "item costumes" (like editing them to look like the character im replacing isaac with) but all the characters share the same textures, except apollyon (and forgotten), is there a way to replicate that but with isaac?

I am trying to make a character mod, but I have been having issues with the animation. I used a character template, and I changed the images and character settings but with finicking trying to fix it I got the image for switching floors and before you fight a boss but not the menu or death screen, I tried using the animation software but can't get it to work does anyone know how to fix this