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.
Esoteric Happy Ending: The Black Hammers lost all the fairies they captured and the Tree of Life is saved...but Michel dies in order to rejuvenate the tree, and Kim leaves the island. While Michel will be reborn later, the bad guys still have the floating castle, and without Michel or Kim around to protect them, the fairies could easily get captured again.
The Black Hammer Gang giving Kim the treasure box as thanks for saving Salome.
Moment Of Awesome: The citizens of Precia chase out the Black Hammer Gang in episode 4, and one of them stands up to the episode's fairy monster with her fists clenched as it sends waves of water their way.