The arc with Hector really should've started and ended in season 3. Shit dragged on way too long, and turned Carmilla from a character that I initially kinda liked, to downright obnoxious, alongside her sisters to a lesser extent, by constantly kneecapping Hector, just to keep that arc going, until they were finally ready to pull the trigger on Hector turning the tables, only to have
Isaac be the one who takes down Carmilla, and not Hector, or at least them doing it together.
Yeah... Only thing that's obvious about this, is some of the writers wanting to make their preferred character swing both ways, for no reason other than to put their tumblr fantasies to paper. Only good part about this, was when Alucard staked both of them Vlad the Impaler style, at the end of that character arc. Mainly because I saw it as him finally taking out the trash.
Isaac's were at least kinda interesting in parts, given how introspective they got for him, but yeah, they also dragged on too long, like Hector's plot. Trevor and Sypha are in kinda the same sort of position, too. Show felt borderline directionless with them, so just kept throwing one side-plot after another at them, just so they had something to do. Don't think their characters progressed even a sliver during most of them, either.
Not gonna lie, Death constantly cursing like a sailor and shit was kinda humorous to me. Which is not what they should be going for, and I doubt it was their intention, but it's what they got, with how they characterized him. Every time he opened his mouth, I found it near impossible to take him seriously.
Almighty Death, who has lived for eons and should have a massive amount of knowledge, reduced to the oral level of your typical internet troll with his 'riveting' dialogue.