I have a slightly different view Kulkan is actually identified as Quetzalcoatl in Aztec Myth, Which then, as I think has repeated through reality/history a 'fall' happened based on the N paradigm, With the Help of Mayan Blood sacrifice He changed persona and the identity they named him as changed to Kukulkan too This fall/change I think happened repeatedly through history and can be seen in the Greek Gods becoming decadent Roman ones,  Sumarian into Etrusican, ect.

Thank you jonas for giving said ancient cultures proper respect

Of course thats my entire argument. It seems your just disagreeing on the order.

Seriously guys klingons and orcs what board are we on. They're different genres with different focuses. Besides tolkien was just a little racist. Star trek has more anthropology but still it's focus is intellectual. Dresden files is about heroism superheroism in fact. A closer fandom analogy would be marvel. But an even closer one is the actual aztec mayan and inca cultures for Red Court. Etruscan roman greek for white
 Slavic russian and lower germanic cultures for black court.

White Court Vampires are Etruscans. This implies a lot of things, but particularly that Roman society was based off of Estrucan society as much as Greek. Early Romans were a mix of Greek colonies and the tribes Latin hills. They frequently traded and were at war with the at the time much more powerful Etruscans. Who frequently traded and fought with the Gauls of northern Italy.

Anyway Romans named many of their early gods after Roman gods. Minerva, Jupiter, Mars all original Etruscan jobs. Mars for instance never reall had much in common with the Greek god Ares.

My point is Etruscans had a major influence on early Rome, including huge influx on sexual peversity and kink. Presumably in the Dresdenverse this was where the White Court had their peak controlling the Roman Empire.

Seven Deadly Sins were formed by Catholocism in part as a response to what they believed to be the ultimate flaws of the Roman Empire and decadence, combined with a growing for chivalry to instill honour in early dark age knights and warriors.

It's possible in the Dresdenverse the White Court are the epitome of the Seven Deadly Sins which is back up by the three major houses, but also in Paranet Papers the RP, where theirs another minor house that feeds on Wrath and fight clubs.

It should be noted that I think it was Quantus who theorises the White Court have more to do with Greek spirit personifications. Eros, Phobos and so on and so forth. It's possible. but the Greeks personified everything into spirits.

.......
RED COURT
Again if you take Paranet Papers as canon which I think it is as Jim reads through it offers advice and approves of it before publication.

The Red Court became powerful because they captured and imprisoned ancient Inca gods. I think it implies they did similar to the Ancient Mayan and Aztec gods. They imprisoned they ancient Inca gods and physical fed on them. You are what you eat.

I believe they did similar things to the Ancient Mayan and Aztec gods which is implied by the Red King taking on Kulkulan name and position, as well as Dresdens theorising he wasn't the original Kulkulan in one line where the Red King wasn't sure who Susan as a KOTC was under the invisibility cloak.

Red COurt feed on blood to the point that it's an addiction and several have shown they find sexual pleasure from feeding. It is a physical addiction to them but I don't believe it has any direct impact on their Morality. Keep in mind the real world Cartels in the same region do everything the Red Court does and are all perfectly human. I would still have major problems if any federal government launched a genocide against all cartel members and gangs. Which has been done before.

What makes the Red Court different is the fact that they have become dark gods. (Mostly retired according to Vadderung). In all ancient cultures gods provided a service, of good fortune in exchange for worship and sacrifice. Some Pantheons were said to abuse this relationship, and according to Thomas as well as a lot of mythos the Dark Gods were defeated by other Gods. Those Dark Gods were put Outside of reality, but are still powerful enough to launch invasions and incursions into reality every so often.

..........

Black Court okay I'm keeping this one short because internets about to run out.

The most common and prevelent theory is as people have mentioned.

Dracula tried to impress big daddy Drakul who might be an Outsider himself trapped in human form.

Dracula tapped into the Outside in an Acnsion ritual gone wrong and became Black Court. Still tainted with the Outside. The Outside in its nature is outside reality, evil and wrong.

We also know Black Court power up from mass killing. That is by any definition Evil.

More later

hmm I wonder if thats the purpose of the mass killings by the Denarians. So that people in strife and crisis commit evil acts to doom their souls, so that they're sent to Hell where Lucifer and other demons get a power boost.

Not when it's been freshly translated.source

 It's like profiting off of Shakespeare because you wrote annotations in the margins for dumb bored teens in highschool. Your still profiting off of people's long dead work and selling it up market for your own profit.

Isn't it illegal to charge so much 200 years after publication?

I've downloaded half a dozen versions on kindle I've yet to find one with anything 'grimm' the definitional word in them nor one that isn't heavily Christianised. At least one tale is consistant in that it replaces a powerful Fae Godmother with the Virgin Mary. There's also tales about a girl in heaven who unlocked the thirteenth door when she was told not to but she was 14 and curious so she did and the Virgin Mary cast her down from heaven, muted her and kidnapped three of her children until she repented.

Yet to find the legendary Grimm and Gruesome tales of Cinderella's Step-sisters cutting off their own feet. I've download 1810 and 1812 translations, but I still seem to be getting the watered down version. Even though a couple are clearly academic standard discussing the merits and nuances of a particular word in German translated to English. Love those footnotes.

Anybody got any idea where I can find the legendary Grimm and Gruesome Fairy Tales that Mab commissioned?

Also so far very little mention of the Sidhe or any beings that could be them. Though I see a few Toot like sprites pop up now and again.

Nic has all but confirmed he fights Outsiders.

And I agree with Anubissama that Mab is not least Evil. Add to the fact that she commands thousands of evil beings. Add to that fact the revelation in Cold Case. Mab is not the lesser evil. Jim calls her the most predictale evil despite the fact that the Fae are notoriously not predictable. Dresden had personal experience with the Denarians and had bested them twice. Their number of evil beings is thirty not thousands plus a couple dozen squires. Dresden also had knowledge of how Lasciel worked through her shadow who turned into Lash.

I like to believe that with his use of soulfire Harry could have done something similar with Lasciel. or atleast provided some interesting contrast as mentioned above. Soulfire and Hellfire.