[bant]

Unfortunately, KOReader puts illustrators, authors, and creators all under "author" tag. Calibre (with my understanding) doesn't seem to have a way to edit creators or illustrators; just authors. No matter how many times I polish, nothing will happen because obviously, I'm not editing creator or illust and the metadata just goes right by into my device.
I can go to Edit Book > content.opf and manually rewrite it, but this isn't a long term solution, not to mention having to check each book one by one is a huge waste of time.
I write this hoping there's a plugin I don't know about, or if there's something I missed that easily lets me edit these things and I'm just too new to know.