I will say, there's absolutely nothing wrong with that multiversity order (in fact it's entirely correct to a tee), but you REALLY do not need to put so much effort into it. There are some basic rules. I literally have all the trades here. 1-6 of Hellboy, then you can start the BPRD (if you want to read outside of just Hellboy). Don't read Abe Sapien volume 3 onwards until the appropriate point in Hell On Earth. You can go batshit bonkers with the reading order, but for large part you can settle in and read large expanses of them without having to jump to other books, and most of the smaller series can be read when you like. Things that link in will generally be as satisfying in either order, whether you knew before or after. Maybe the only exception is Sledgehammer stuff, like the iron prometheus or 44, might be good to get that at the right time. It is all fucking GREAT stuff though.
I actually really wanted to say during the discussion about Remender earlier, is it's what I love sooo much about the general Mignolaverse and Hellboy specifically. Mignola's style is, well not sparse, but the art always speaks for it's self first, then words coming when necessary.
Whatsinaname nailed it though, Seed Of Destruction first. Also, it's jsut slightly weird because John Byrne actually scripts that then Mig does it all himself after that until volume 7.
