- Broken Base: While half of the fanbase enjoy Gyu! for its new Boarding School concept, the other half cite the Oddly Named Sequel as one of the weaker parts of the show due to breaking its tradition of a Cute Witch format into a standard Magical Girl Warrior show (done probably because of the success of the second half of the original series, which followed a similar format). In addition to its abundance of Filler and the introduction of Loads and Loads of Characters when there were plenty of characters from the original show who haven't received Character Development, there will be plenty of arguments about it. Some people also believe that the original director of the series, Junichi Sato, leaving during the beginning of Gyu! might have had something to do with it.
- Dork Age: Gyu! is seen as this due to the change in the show's formula as well as Junichi Sato leaving the series.
- Ear Worm: Both openings.
- Fanon Discontinuity: Part of the fanbase likes to pretend Gyu! never happened.
- Fan Preferred Pairing: Rein/Eclipse was, at least, initially more popular than the Official Couple Fine/Eclipse. In a popularity poll done by the Japanese fan community, Rein/Eclipse topped the list. Even the artist of the manga adaptation, Mayuki Anan, seems to lean towards this pairing as well since this pairing got the most Ship Tease despite that all pairings were left ambiguous in the end.
- Les Yay: Sure, Altezza got paired with Auler, but there was plenty of this between her and Sophie.
- Memetic Mutation: When Rein got pissed with Altezza in episode 10 of the first series, she yells, "What was that?" ("Nani yo") to which some Japanese users phonetically transcribed it as "Haniho" and ran with it.
- Moment of Awesome: The fight scene at the end of episode 26 showcased badass fighting skills from Shade and would lead to a Downer Ending where Team Rocket Wins and The Reveal.
- Seasonal Rot: The second season, Gyu!, is generally regarded by fans as the weaker series due to its abundance of Filler, poor Character Development, and change in direction of the show's formula.
- Ship-to-Ship Combat: Fine/Eclipse and Eclipse/Rein fans were constantly at strife. Meanwhile, interestingly, no one really cared about who Bright would end up with.
- Strangled by the Red String: After establishing the Love Dodecahedron for the majority of the first season, during the last couple of episodes, Shade and Bright redirect their interest to Fine and Rein respectively. While Bright did get enough development to bridge that interest, especially when Fine's fear of him makes him realize she never understood him, whereas Rein tried to directly confront him, Shade's interest in Fine is less implicit. It's hard not to see Shade rebounding towards Fine after realizing Rein will never like him romantically.
- They Wasted a Perfectly Good Character: Several princes and princesses from each of the kingdoms only show up for one episode or less. Prince Solo from the Seed Kingdom comes to mind: he was only briefly introduced in one episode of the first series. He was then given a A Day in the Limelight in the second season before being shoved into the background altogether again.
- Toy Ship: Milky and Nalro got some Ship Tease and both of them don't even know how to talk yet! Nalro hasn't even learned how to walk!
YMMV / Fushigiboshi no★Futagohime