These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Dorothy of Oz
Big Lipped Alligator Moment: Arguably, Tail grabbing and kissing the rat in the fifth volume. This could just be him trying to get over his phobia of rodents, though...
Foe Yay: Sepia and Selluriah, though this is done intentionally. She asks if he enjoyed her transformation sequence, and he responds with a very enthusiastic, "Yeah!" before remembering he's supposed to be trying to kill her and denying it...all the while surrounded by his still Distracted by the Sexy underlings.
Jerkass Woobie: Number Fifty. His reason for being so outrageous and hateful is that he's never been treated with any amount respect in his life, even being denied the privilege of having a true name. On top of that, the one person who he fears above all else turns out to have been looking for a reason to kill him for years. And just when he thinks he's going to be alright and able to live out his life peacefully, Number Three, his aforementioned worst fear, pops up and brutally murders him.
Tear Jerker: Indigo and Selluriah's deaths, and Mara's reaction to it.