I think the grey background is a big no from me, but everything else is cool and quirky

I think the skullduggery pleasant vampire is pretty brilliant and it works with the metaphor of vampires as exploiters. Like I see them as sort of like old men who marry young women and vampirically live off their youth... but your skullduggery pleasant is brilliant to: wealthy men like LISK (long Island serial killer) who appear normal and pleasant on the surface but have such horrible fantasies that they let out when no one can see them.

I think if Smeyers had wanted to create beautiful immortal people who can sometimes be prats but are basically so above humans that we can't really judge them... she could have used Fae. Heck Sarah Jay Maas even has her character become a Fae and Smeyers could've thought that up.

The problem with vampires is that they are fundamentally a metaphor for exploitative and parasitic people. They cannot be good-the best modern vampire tale I ever encountered was Being Human, were vampirism was an excellent metaphor for being a drug addict