Alternate Character Interpretation: Gavin is furious when he finds the skeleton of a once mighty dragon put up for display. As a Dragon Brother he feels that dragons should be respected and not held up as museum pieces. Then we learn he's actually Navarog which puts an interesting spin on this reaction. He may have just been faking his anger, rationalizing that it would make his Gavin persona stronger. Or it might be an actual Even Evil Has Standards moment where he is legitimately angry that one of his brethren is strung up like some trophy.
Both averted and played straight, depending on the situation; it kind of becomes necessary with the Trauma Conga Line.
Still, averted frequently like when Seth thinks Kendra died and the times when Kendra thinks her family and friends are in danger of dying, but there are moments when a character experiences a crude death but the team has to keep moving.
Base-Breaking Character: There's some debate as to whether the two leads are both strong yet flawed individuals who make up for each other's faults, or if they simply fail in their own way.
Some see Kendra as a responsible but still fun foil to Seth who grows into her role as the Chosen One. Others feel she has only superficial flaws.
Seth: whilst his rash and bone-headed actions in book one are called out, there's a split as to whether he learns from his mistakes and grows as a person or continues to make reckless decisions and the narrative bends over backwards to justify them.
Draco in Leather Pants: Despite everything Gavin does in book 4 and The Reveal that he is Navarog some fan girls are still hooked on the idea that he still good and loves Kendra.
Magnificent Bastard: The Sphinx. He plays so many games on so many fronts that no one can keep up with him. He abducts and clones Kendra at a time when she's under constant watch, manages to be the leader of the good guys, half of the missions end up with the reveal that they did his work for him... oh, and he does this all while remaining one of the most amiable characters in the series. He gets Out-Gambitted by Graulus and Nagi Luna, and he switches sides and skillfully maneuvers them to their doom. In the end, he does so well that they make him an Eternal, ensuring he will have to die to open the prison. The Fairy Queen says he's sincere, but he still got what he wanted in the end. Oh, and that fifth secret preserve no one has been able to find? He went there as a slave when he was a child, and rose to leadership of it.
What an Idiot!. Seriously, Seth? Opening the window in the middle of midsummer's eve, while there are a bunch of unholy hellhole unseelie reverse doubleplusungood beasties on the loose?
The Woobie: Raxtus. Being half-fairy and half-dragon would be bad enough, but he's also a "Well Done, Son!" Guy to his father, the king of the dragons, who makes it very blatant how he feels about his son. Thankfully, he Took a Level in Badass in the fifth book and impressed his father enough that Celebrant took him back to Wyrmroost to be properly trained.
Write Who You Know: Word of God admits that his real-life little brother is impetuous in the same way Seth is, and while they're not exactly the same person, they're very close.