Adaptation Displacement: Meta-example for some of the Novel Worlds. Viewers more familiar with the Disney versions of the stories might think Pinocchio's friend Meru is an Original Character, when she's actually the Blue Fairy, who was much more prominent in the original book, and may be surprised at The Little Mermaid's tragic original ending which serves as a major plot point for the episode.
Creator's Pet: Gaoh. The 2015 fandom generally agrees that he's too boring to have deserved around a quarter of the series to himself, especially when characters with more potential such as Hols and Drago (see They Wasted a Perfectly Good Character below) got shafted in favor of him.
Bakumaru even moreso, he may be the main hero but he's also a Bratty Half-Pint that goes on EVERY SINGLE MISSION except for the Boy Who Cried Wolf and Bremen Town Musicians.
Among the 2015 fandom, Kirinda, due to the ridiculous juxtaposition of a giant badass robot war steed being a lovable mischief maker who talks in a Kansai Regional Dialect / Southern twang. This juxtaposition is taken even farther when the Adorkable Lydia, who becomes an Ensemble Darkhorse in his own right, is revealed.
Pochiro is also rather popular in some circles of the fandom as well.
When Bakumaru gets his hands on a not-a-Game Boy, he gets dizzy after the graphics jump out at him. He probably should have taken a break every half hour, as the company that made the Portable Gaming System would go on to prove that, twice.
When asked about what happened next after he was carried offscreen at one point, Pakaracchi goes on an irrelevant tangent, starting with "It was the year 2015!" That just so happened to be the year that the MugenX English fansub resumed production after being in Development Hell for several years, and this was the next-to-last episode that was translated before the hiatus. So, it being 2015 really was what happened next.
This show is basically about a group trying to stop someone from drastically changing famous works of literature like Moby Dick and Frankenstein. About 9 years later, The Fairly OddParents! have a half-hour special with that same exact premise involving those two same exact books.
A cat fairy causing trouble for being embarrassed by an event? Are we talking Chocolat or Siren
Iron Woobie: Pretty much all the Eto Rangers become this at the climax of the series, watching their friends die and whatnot.
Monk is another example, as he frequently engages in pranks that upset people, but he also gets plenty of moments where he's on the receiving end of humiliation and in the Grand Finale, Monk goes berserk when Pochiro sacrifices himself to save Monk.
A surprising example as we learn near the end is Nyanma a.k.a. Chocolat herself, as her rampage is her attempt to get revenge against Princess Aura, who she (mistakenly) thought had promised her a victory in the Etoranger qualification race if she started right then and then disqualified her as a dirty trick. Actually, that was Bagi's doing; Bagi played Chocolat/Nyanma for a sucker.
Pochiro also shows shades of this. Yes, he often picks on Monk and one time deliberately kicked a soccer ball at Tart's face but he's just so cute that you can't hate him. You kind of just want to hug the poor bastard when he was caught hording food and gets beaten up for it and starts sobbing in the Hansel and Gretel episode. Also, watching him die to protect Monk is downright heartbreaking.
Bakumaru himself is a loudmouth Bratty Half-Pint but he's practically beaten half to death by Geton in the Mouse's wedding episode. Plus, he also was a vicious speciest in the Puss In Boots episode but you still have to feel some sympathy for him on account on his PTSD-ish reactions to cats. By the climax of the series, Bakumaru has experienced so much loss that you just want to hug the poor brat.
Among the male rangers, there's Pochiro. While most of the time, he's a serious and badass samurai but whenever he shows his goofier, lighthearted, more comedic side, you can expect extreme levels of adorkable-ness that would give even Nyorori a run for his money. It's especially evident if Pochiro isn't wearing his usual outfit like when he was dressed as a baker in the Hansel And Gretel episode or when he was dressed in a pilgrim outfit in the Bluebird Of Happiness episode.
Urii, whose basically an adorable little piglet and the Tagalong Kid of the rangers.
There's plenty between Bakumaru and Cream, starting in the very first episode. Later, they become an Official Couple.
Tart has obvious feelings for Gaoh, but Gaoh doesn't return her feelings. Japanese fans tend to pair her with Pochiro.
There is some ship tease between Pakaracchi and Souffle, and he even attempts to confess to her at the end, but she's busy talking about something else.
Gaoh is still very fond of his old childhood friend Chocolat, and in fact, episode 33's flashback reveals that he and Chocolat used to be dating (with Chocolat jokingly threatening to break up with Gaoh if he finished the race ahead of her). His fondness is strong enough that even when he has a chance to finish off Nyanma during the Grand Finale, he doesn't take it. In addition, he doesn't return Tart's feelings for him.