It's been said that Adi Shankar's Devil May Cry series might cross over with his previous work on Castlevania. But if CV was to share space with other fictional works, shouldn't it be with other Konami IPs?
So I pondered a shared universe for the company's otherwise unconnected games. A "Konamiverse" if you will. But unlike, say, Capcom 's SFU or Koei-Tecmo's "Ninjaverse", this Konamiverse would be a non-game setting, like a comic book or animated work. It'd take the basic premise of each game series and put them all in the same world (or universe, to include works set in different time periods or other worlds entirely). You could start with major established series like Castlevania, Metal Gear, and Silent Hill to set this Konamiverse's framework. Then you could work your way down to the likes of Bloody Roar, Getsu Fuuma Den, Rush N' Attack, and Lethal Enforcers to the obscure or outright forgotten like Nanobreaker, Arumana no Kiseki, Kensei: Sacred Fist, Jackal, and more.
And then... that's it really. Various Konami IPs quietly co-existing in the same fictional space, occasionally crossing over with or at least referencing each other. No massive Avengers-style teamups as is so often the case in shared universes, though I've no doubt someone in charge of a Konamiverse will certainly try.
This is just the long version of me saying I'd be down for an amnesiac Julius Belmont saying he survived a town heavily implied to be Silent Hill. Or that John Morris met "...an old former bandido living south of the border after bounty hunters shot him off a train. He taught me a few new ways to fight with this whip but I reckon the boiler plate for a shield was a bit much."
tl;dr WE SOME KINDA WAI WAI WORLD