Yoh3t

This fic is on fanfiction.net and is 50 long chapters.

Not for Welf x Hephaestus (This ship doesn't match at all, despite the Crozzo family having the Blessing of the Vulcan Spirit)

One. (And F for Bell)

Yes for Nana Shimura, and no for the option 2

F for Talk no Jutsu, oops, wrong anime...😅😅😅

Naruko, Hitomi and Yuto (FSakura)

Ikaros

Or he can go the Kill la Kill route from Junketsu and Senketsu

You also forgot that Jackets also have pockets, where Masa can store miscellaneous items, making him a notable thief if he wanted to. With the zippers, he can do like the Ope Ope no Mi, dividing someone's parts.

There aren't many RE stories around here, so I'm going to support this fic, hoping Author-san doesn't drop it. From what I've read, this fic shows promise.