- Awesome Music:
- MAKKA NA CHIKAI. That is all.
- "Hangeki" on the official soundtrack.
- Cliché Storm: But a very entertaining and over-the-top one.
- Critical Research Failure: By author admission; the words "carnival" and "cannibal" are completely unrelated.
- Ear Worm: The opening theme, Maka Na Chikaii, is apt to get stuck in your head. Especially the Whoaaohh whoa-oh whoaaohh whoa-oh da-danana da-daaaaa!
- Ensemble Dark Horse:
- How can you not like Papillon?
- Moonface plays a small role in the series but is one of the most memorable characters, due to his distinct appearance and mannerisms.
- Captain Bravo is incredibly popular, especially since he's an Affectionate Parody of many action tropes. Fans are disappointed his role isn't bigger.
- Hilarious in Hindsight: In the Beach Episode, after Kazuki and Tokiko see Captain Bravo surfing, he responds with "YES! I AM!", which is the catchphrase of Mohammed Avdol from JoJo's Bizarre Adventure. It's even funnier after Captain Bravo's seiyuu voiced Avdol in All Star Battle.
- The first arc involves a teenage boy and a powerful, teenage, blue-haired girl fighting against humans who have been turned into monsters by a butterfly-themed villain (with a french name, no less) that the boy knows in his non-heroic life, with all three gaining power from transformation trinkets about the size of a deck of cards. Sounds like someone did Ladybug and Chat's story a few years early!
- Ho Yay: The Furo Scene described in the Foe Yay entry. Actually, size comparison seems to be a recurring sub-theme in the series: in episode 18, we see Kazuki and Gouta taking a leak in a river, side by side. Gouta turns to take a peer at Kazuki and immediately thinks that, compared to him, he's an "UNDERDOG!!!" (complete with English text!)
- Les Yay: Mahiro seems to like girls, especially Tokiko.
- What Do You Mean, It's Not Symbolic?: In episode 2, when Kazuki leaps into the air to dodge the frogs' attack, you get a clear shot of the moon with a strange ring around it. It turns out that that's the alchemical symbol for gold... or also the Sun.
YMMV / Busou Renkin