Blade 1:
What exactly are purebloods? I *guess* vampires can simply have children normally, because they talk about being "born a vampire". And being born of a changing vampire produces a daywalker, IE blade.
It's just weird since the pureblood/turned tension is a major plot point, but we never see it spelled out that vampires can have children.
Also where the hell did they get enough blood to fill the fire suppressors for the initial rave scene haha. Vampires in this setting must only have to eat like once a week. Because there are like a hundred at the disco, and they're just a subgroup, and feeding is always shown as lethal/creating a vampire. Hell maybe they only have to feed once a month!
Blade 2 spoilers I guess, but it's an action series and doesn't pretend to be much more:
So the clan family heads were all sorta-murdered in Blade 1, but now there's this nosferatu-esque guy who's in charge. Why's he a nosferatu? Also he looks like the reapers, which makes sense since he's their father, but wait his daughter is normal/vampire-sexy!
How did the reaper escape?
Why doesn't he have to feed like his progeny do?
The heart's encased in bone, alright, but why don't bullets still work? Eh I guess it's strong bone.
Mainly...
HOW DID BLADE FALL IN LOVE WITH THE NOT-SERENA
She literally trained for years to murder you. She's the daughter of the local vampire king. You know the vampire team is planning to backstab you... later you show you REALLY planned for that. Yet you save her life and practically cry over her.
For that matter, how did she fall in love with you
Also when that one vampire gets infected, why did he try to hide it. This is some Aliens-level stupidity, I guess he didn't love his girlfriend as much as she loved him.
In general, why do the vampires keep sending mooks to attack Blade. But that's nitpicking to an extreme... Almost as much as wondering why characters always patiently wait for their opponents to pull the swords/knives out of their bodies before continuing the fight.
Why did the vampires preserve Whistler
Why doesn't Blade cure his vampire hostage at the beginning, instead he leaves the vampire alive to murder more people.
I actually liked both movies though