My only claim to expertise comes from dozens of books I've read and movies I've watched so... What the heck, lets see how much I remember. (I'm sixty. I'm fine with corrections or nit picking. lol)

Lets start with the non infected voluntary servant, IE, the Renfield character type. Note, not PC by any means.

This servant of Drac is often/traditionally a son of a whore, born addled in mind/incurably mad due to maternal pox or other foul disease. Often portrayed as viciously abused as children. They are not hypnotized but come voluntarily to service. There are hints of an overpowering man crush (seldom addressed in early portrayal but fully actualized in more modern pieces,) idol worship, or strung along on promises of future reward. They both "run errands" and keep pests away from Drac's sleeping place by sheer dent of a ravenous appetite for the devouring of bugs and rats.

The Renfeild are not converted so they can run daylight errands.

My favorite portrayers of this character type are Michael Anthony Richards as Fejos and Arte Johnson as Renfield. I lump Martin Alan Feldman as Igor (Young Frankenstein) in here because, though not a Drac character, it runs in the same vein and is laughing and lovingly portrayed as such. As you can see, I like my horror tongue in cheek.

Then the hypnotized servants, often dormant until called. These often are not aware they are in service to a Drac.

Then you have the bitten, only partially drained but not fed bond. These are infected in a milder form and often require multiple bites and occasional boosts with hypnoses to maintain control. These are the meals on wheels of Dracs world. It's not delivery, it's Dracula's on call snacks.

Then the bitten, drained to the last heart beat, and fed a small amount of blood (Not necessarily Drac's, vampires do not make cells because they are dead. Their victims recycled blood?) from his veins. These are sometimes shown being fed from a small cut on a finger. These are fully bonded/infected but not converted. Children of the Night?

Then the converted lesser Drac, bitten, drained to the last heart beat, and fed directly from an artery, fully infected but not having equal powers.

Then, I think, full Drac, bitten, drained to the last drop, kept in a semblance of life only by the Dracs will, and fed directly from an artery, fully infected, and granted full powers. Sometimes these include a spell or ceremony to complete the change.

Often full Dracs are seen as violently territorial.

I will leave The Brides and Harams to someone else.

That was fun! TY. :D