Technically there's already plenty of space for boobs on chest pieces. It's just not generally designed around. So you'd have to move the sorta domed bit up to accommodate boobs.
As for why you'd develop boob plates, it'd be the same reason some armor has abs or cod pieces. Purely aesthetic...
Incidentally wasn't Tenjin Sama essentially this irl? After he died he ended up getting raised to Kami status, with a brief stint as a Yokai, and is currently still prayed to.
Also I was gonna mention Death Mage but was beat to it.
Obviously there are good fanfictions. The majority however, are mediocre or trash. But that's fine, after all most fanfiction authors are amateurs and a lot of the time haven't written anything before.
Either he's a recent convertee or that ain't the actual reason. Makes no sense to start a series that has magic and then drop it because your religion doesn't allow magic.
Nah. After 5 dragons the problem is the rider. Plus fuck them. Dragging to their shithole of a world and not having the decency to give me anything if i refused their request.