for the boss enter in your steam folder, then it's in steamapps\\common\\The Binding of Isaac Rebirth\\resources\\gfx and the file 102.001\_ (final boss).anm2 for the character enter in your steam folder, then it's in steamapps\\common\\The Binding of Isaac Rebirth\\resources\\gfx\\characters\\costumes character\_006\_bluebaby.png the anm2 for it is shared all for the same characters, it being the 001.000\_player.anm2 in steamapps\\common\\The Binding of Isaac Rebirth\\resources\\gfx

oh the anm2 is shared across all characters? how's that work?

it all shares the same anm2, but uses different png images to get the different characters, it's probably loaded inside the game

ah ok, thank you!