Dorafraki is actually Almeida, a [b]Doraf[/b] from Granblue Fantasy. Her name, Dorafraki, is actually based off how I mispronounce Dothraki from Game of Thrones.

Grafdakka was obviously a Mega Dread from Warhammer 40k, if his name and general attitude didn't already tip you off. Dakka being an iconic word for the 40k orks for gunfire, which Grafdakka has a lot in abundance. There's also a faux German thing I'm going with him, what with Graf being a noble title in German and Kreig meaning war in german. There's nothing particular about Mu-01 as she's just some face I stole off the internet, though I'd like to point out that unlike Ryo, Mu-01 is an actual mecha maid.

Fran is pretty must just a nameless faceclaim I took off a booru and I made up her backstory from scratch. Which was easy since her backstory mainly consist of "Is a succubus who likes being a futa and uses a giant axe". Before Rune left Fran did have a bit more of a history in that she used to be a mortal counselor who brought ruin to some kingdom, but Fran doesn't remember the mortal part of her life and just lives out her vices. I like to think that she's basically Gilles De Rais if female and summoned as a berserker. LOw rank mad enhancement though, Fran isn't insane, just depraved.