My first pick would be Blade for sure, made long before marvel films were cash cows (setting a different precedent), with a more serious tone.
His earlier, and much less serious film is Death Machine I think (starring Brad Dourif from the 80's Dune & Child's Play), check it out if you get the chance (likely its streaming free somewhere).
As for Robocop, I think it fits in fine, as he has his own comic books (& inevitable crossovers), and there are plenty of comic book characters with similar backgrounds (former normal Joe who is mortally wounded and transformed into a cyborg is common enough). Cyborg (real original name there bud), Bloodshot (Valiant Comics?), and even the Winter Soldier come to mind.