Love Triangle: In Book 1, Kylar is caught in one with his best friend Logan, who's in love with his childhood friend Serah, who loves Logan but also has feelings for Kylar, who doesn't reciprocate. And then, Kylar gets into another love triangle with his own childhood friend Elene and his former enemy Vi.
Meaningful Name/Meaningful Rename: All three of his names have meaning as explaiend by Wolf. "Azoth" is an old language meaning "quicksilver", formless and ever changing. "Kylar" is similiar to the word "cleave": it means both "to kill" and "one who is killed". And his alias as "Kagé", which means Shadow and also links him to the Sa'Kagé.
Punny Name: "Azoth" is an poetic word for mercury, coming from the Arabic. Azoth, as a wetboy, will be mercurial in his disguises.
It should be pointed out that Durzo is only against actual relationships and love, he has no problem with the physical side of things, so long as its just that: physical. This, after all, is a man who goes on multiple day long drinking and whoring excursions on a semi-regular basis, at least often enough that when he goes to do it again Momma K asks him "How long will you be this time?".
Scars Are Forever: The scars on her face she received as a child from Rat — an X-mark on her cheek and lips, and a loop from the corner of her mouth to the outside of her eye. For Kylar, it's a reminder of his failure. For Elene, it's a reminder of Azoth/Kylar saving her.
The Corruption: The vir. Its one of many reasons he doesn't use it, preferring to rely on his Talent and other gifts. Its far more corrupting than he thought and is using it too much is probably the main factor behind his Face-Heel Turn.
Faith Heel Turn: He'd been doing bad things up to this point already as God-King Wanhope, most notably murdering every single one of his brothers (young kids included, and even forcing pregnant concubines to have abortions) but he justified it by hoping and praying that God was on his side and that now all potential rivals (who would have been puppets of the Vurdmeisters) he could finally get round to being a good, reforming leader. But learning that Jenine's husband was alive immediately before his wedding pushed him off the deep end and he decided he couldn't take any more, forsook God, and started truly thinking of himself as a God-King.
Love Hurts: Dorian loves Jenine so much, but loses her to Logan in the end.
Mad Oracle: Parts of the trilogy, this IS Dorian. But at the end he really does become mad. Maybe. He smiles at Vi when she realizes he implanted Kylar and Elene's child in Jenine. He might not be so mad as people think.
Necessarily Evil: What Dorian first thinks of him becoming Godking Wanhope. He then realizes that he has to do despicable things to keep the people in line, and to save his wife, Jenine. Towards the end of it, though, between his behaviour and the vir and his returning madness that the vir is making worse, he becomes indifferent to Jenine's fate and starts thinking about how he "deserved" to be God-King, and it takes Solon to make Dorian realize that he'd started to forget the "necessarily" part and was becoming a full-blown villain.
One-Winged Angel: Dorian's confrontation with the aethlings in the Citadel hall.
Training from Hell: While being groomed as the Godking's heir in his childhood/teens, Dorian had to flay a woman alive and kill his mother, along with a host of other horrific behaviour. But what sickens Dorian the most is that, being a child and not knowing any different, he used to actually enjoy it and didn't think he was doing anything wrong.
Well-Intentioned Extremist: He feels he has to act like a true Godking (ie. The Caligula) in the present to put the fear of...well, God...into his subjects since the culture of Khalidor is so corrupt that all of them would interpret kindness as weakness and try to kill him. His plan is to gradually introduce more and more reforms and eventually cut the insanity out of is kingdom for good, in other words for the Greater Good. However, by the end he sees that the Greater Good had become an excuse and he was becoming just as depraved as his father was for the sake of an imaginary future.