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.
Iron Woobie: Despite all his misfortunes, the always sickly Opeo has resolved to become stronger by pursuing the path of the ninja.
Jerkass Woobie: For all his faults, Ace seems honestly convinced that the Prince is just as big a Jerkass as Ace himself is, and that the Prince deliberately tries to exclude him from adventures or getting credit for his deeds.
The Scrappy: Ace's sheer arrogance, nastybehavior, and stubborn refusal to learn from his experiences, combined with his frequent appearances, causes him to grate on a lot of readers' nerves.
Tear Jerker: Following the Frosty Peak arc, Ace shows what he learned by giving the Prince an empty box. What makes this painful is how he basically tells him right to his face that in his mind, their friendship is worth NOTHING.