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: The Movement
The Comic Book
Adorkable: In her brief appearance so far, Vengeance Moth has shades of this. Fruit snack?
The Woobie: Burden. He thinks he's possessed by a demon and accidentally killed his father. Guilt-ridden, he runs away from home.
Ax is overly-formal to compensate for the fact that he's homosexual, which is forbidden in andalite society. His goal was to seem so perfect to the andalite authorities that if he was ever found out, they might have leniency for him. This habit carried over to his life on Earth. It helps that he had a crush on Tobias.
Rachel is slowly going more and more insane due to her violence. She acts like a Dumb Blonde to cover it up, and she gets meaner and meaner as time goes along, driving her friends away. She eventually goes on an impossible suicide mission and dies.
Tobias feels the need to be more and more human to have a functional relationship with Rachel. She's mean to him (due to her gradual slip into insanity), making him think that he's not doing a very good job, so he tries to be even more human. In the end, he becomes a human nothlit during a mission and is instantly killed.
Badass Decay: Rachel. She's still dangerous as the series goes along, but 'badass' implies sanity.
Fanfic Fuel: The author takes advantage of the fact that the Peace Movement is largely absent from the Animorphs series.