Everworld/YMMV

Alternate Character Interpretation: Senna, holy crap, Senna.
Badass Decay / Flanderization: David starts by seeming like a more Badass Jake, even with/made more impressive by how he was a loser in the "real world", but his weaknesses eventually overtake him until mental weakness is more or less his defining feature. Unusual in that it arguably worked out for the better, letting the other three become stronger while he hit bottom. He does start to recover in the last two books, though.
Base Breaker: Everworld is obscure and has a small fanbase, but for what it is, Senna serves this role. She's either hated for being an evil, arrogant, manipulative bitch or loved for being an evil, arrogant, manipulative bitch.
Complete Monster: Ka Anor is the living embodiment of everything bad. Hel is equally twisted, albeit on a more personal level, with even other gods thinking she has issues.
Crowning Moment of Awesome: The climax of Inside the Illusion. It triples as a crowning moment for Senna, Sobek and, suprisingly enough, Keith.
- Jalil blackmailing an entire religion in Book 8. By knocking Senna out and threatening to destroy the African gods' afterlife by making her bleed on the tree that holds their Heaven and Earth together? And successfully pulling it off, with help from only two (David and Thorolf) conscious people? Jalil is fun like that.
- David's personal crowning moment comes when he, while in a hopeless situation and less than a day away from dying, convinces Nidhoggr to help him, flies the gigantic beast over to Fairyland, helps him avoid the death trap set up for him, and simultaneously saves everyone's lives while resolving all of their problems. The same incident marks the first time in the books that he did something despite Senna's disapproval.
Draco in Leather Pants: Senna, in the portion of the fandom that love her. They tend to ignore her love of Mind Rape, Freak Outs, and petty cruelty in favour of her awesome manipulative skills, planning, and Well-Intentioned Extremist motives.
- Interestingly enough, Senna is also an in-story example of a Draco in Leather Pants. April, Christopher and Jalil consider her to be a Devil in Plain Sight, but David spends the first five books trying to convince the others that she's good, and the next six trying to redeem her.
High Octane Nightmare Fuel: Powers a lot of the tension in the story. Ka Anor, in particular, is ~~an insectophobe's~~ anyone's worst nightmare. Ka Anor is Fear.
- In-story example: The first thing Senna did with her witch powers was to disguise herself as Gollum, then sneak into April's bedroom while she was asleep and hiss out, "Wake up, my preciousssss. Is it awake? Gollum . . . Gollum . . . or is it dreaming, precioussss?" Poor April was only eight at the time, but holy crap did Senna ever get a kick out of that one.
- Combined with an in-story example of Fan Disservice: Hel, who is deliciously sexy enough "in profile alone" to render the male characters incapable of thought. Until she reveals her other side, rotten, decaying flesh riddled with worms and falling off her bones. The worst part is that the guys are STILL helplessly attracted to her, even while being repulsed to the point of nausea. The detail in which she is described can only be called excruciating.
- KAA loves this as always. #4, Realm of the Reaper, might be the best example.
- The Yeerk pool, Hel's domain, the Bosch painting...I'm sensing a pattern here.
Jerkass Woobie: For all her selfishness, malicious tendencies, controlling personality, and generally being a bitch, the ninth book makes it very hard not to sympathize with Senna.
- David also qualifies, being an uptight Heroic Wannabe who's more adept at pissing the group off than actually leading them, while simultaneously being an insecure wreck, stemming mainly from his molestation as a child.
- Heck, pretty much everyone in the core four qualifies for this. They're all jerks on multiple occasions, but they're all going through so much that you can't help but sympathise. Jalil's arrogant, Christopher's a jackass, and April's self-righteous, but in their situations, would you do any better?
Launcher of a Thousand Ships: Not quite a thousand, but let's face it—April has some Ship Tease with all three of the boys (including, yes, David), and Galahad, and that's not counting the people she dates in the real world.
Magnificent Bastard/Smug Snake: Senna can be perceived as either or both. On one hand, she is extremely intelligent, Dangerously Genre Savvy, often successful at what she does, and inspires grudging respect from the core four. On the other hand, she is also quite arrogant, disdainful of others, extremely self-satisfied with her own intelligence, and can sometimes overestimate herself or underestimate her opponents.
Mind Game Ship: Perpetrated and exploited by Senna, especially towards David.
Moral Event Horizon: Ka Anor was a monster from the start, but his devouring of Ganymede nicely cements this, and establishes him as a Complete Monster and not a Designated Villain. Senna arguably crossed from her first Mind Rape of David, but a better example is in Book 11, when she goes totally off the deep end and orchestrates the massacre of hundreds of people to feed her lust for power. As for Hel...pick a moment.
Relationship Writing Fumble/Slap Slap Kiss: Expy Christopher seems to have inherited this from his original, Marco. He has a Slap Slap Kiss relationship with April, and admitted to finding her attractive. The Official Couple, Jalil and April, struck some as surprising because of this.
Selfish Evil: Senna honestly doesn't care about anyone other than herself. She's also the series' reigning queen of Moral Myopia and It's All About Me. Hel is even worse in this regard.
Tear Jerker: For those who sympathize with Senna, Inside the Illusion will have some moments. For everyone else there's Ganymede's death.