The 2005-2006 series of Kamen Rider, is the sixth installment in the Heisei Era, Kamen Rider Hibiki was intended to be a radical departure from the standard Rider formula in order to shake up things in response to the declining ratings and sales of the franchise.A secret war is taking place between the Oni- humans who have trained their bodies to be able to harness supernatural power- and the Makamou, demonic creatures that lurk in the forests of Japan. Into this conflict stumbles Asumu Adachi, a young boy who is unsure what he wishes to do with his life. He encounters one of the leading Oni of the Takeshi organisation- a cool and confident man named Hibiki- and soon they develop a student-teacher relationship.Later on, additional Oni enter the story: first, a mellow young man named Ibuki and his young student Akira, who is in training to be Ibuki's successor as an Oni. Meanwhile, an excitable new Oni named Todoroki wishes to create his own legacy under the watchful eye of his veteran teacher, Zanki.The story is told from the perspective of Asumu and is very much a Coming-of-Age Story focusing on the relationship between mentor and student, the old and new generation and the choices that we make in life. The Oni are all Musical Assassins, using their "pure sound" to purify the Makamou they fight. The series also averts Hard Work Hardly Works by showing the Oni training hard to maintain their bodies and ability to use the Oni power; in fact, an entire arc- "Summer Of Training"- is devoted entirely to their training efforts.
This series contains examples of:
Acting for Two - Zanki and movie-only Touki. Lampshaded in the after-credits movie teasers.
Alliterative Name - Every Oni began life with one; upon becoming an Oni, they adopt a new name that begins with the same letter (Ex.: Hitoshi Hidaka -> Hibiki). Though Todayama was briefly given the option to take the Zanki name.
Badass: All the Oni, but especially Hibiki and Zanki
Badass Normal: Most of the Oni are strong fighter even untransformed. Justified as they always trained their body and most of their strength come from their own training instead of being just Instant Expert. Biggest example would be Zanki after his semi retirement before Shuki shows up
Big Eater - Todoroki. Mentioned to be the source of his strength in the Hyper Battle DVD.
First Name Basis - The one-year-later Distant Finale is open-ended as to the nature Asumu and Hitomi's relationship, but the change from calling her "Mochida-san" to calling her "Hitomi" is pretty blatant, nonetheless.
Homage - A couple to Shotaro Ishinomori's earlier work, Henshin Ninja Arashi, which, according to rumor, Hibiki was at one point planned to be a spin-off/sequel/remake of. The Oni Armor used by briefly used by Shuki was visually inspired by Arashi himself, and the Makamou that appear in The Movie bear a symbol remiscent of Arashi's Blood Wheel Clan.
Honest Axe - Asumu learns to narrate this fable towards the end of the series. It's relevant to the plot in a way, as Asumu has to be honest with himself about whether the path of an Oni was ever the one for him.
Karma Houdini - Kiriya eventually gets his wish to become an Oni despite all the crap he pulls to try and cheat his way to the top. However, this could be a subverted trope, since he does get much character development and becomes more humble towards his superiors. He even admits to his rival Asumu that he thinks well of him in the epilogue.
Musical Pastiche - The instruments of the opening theme change depending on which Oni is the focus of the episode. (e.g. Drums for Hibiki, trumpet for Ibuki, electric guitar for Todoroki.)
Mythology Gag - the traditional Rider Kick is no longer the finishing blow of the season, but that doesn't stop our heroes from executing them anyway, from as early as episode 2. Black RX did pretty much the same thing.
Hibiki being utterly crap on a motorcycle (pre-Re Tool) could fall under this.
And the three primary Oni's special salutes hark back to Godai Yusuke's thumbs-up gesture in Kuuga.
Non-Serial Movie - Despite providing a backstory for the Takeshi organisation, the different origin for the Armed Saber and the actual presence of Orochi, an offscreen monster in the series finale, qualify The Movie under this.
Only Known by Their Nickname - The Oni all go by their Oni titles in everyday life. Only the real names of Todoroki (Todayama) and Zanki (Zaitsuhara) have been revealed.
Palette Swap - Hibiki's first powerup form is... Hibiki in red and silver. The one that follows is significantly more elaborate. And Zanki and Todoroki look exactly the same, apart from bronze and silver detail respectively.
The Power of Rock - Todoroki (and to a lesser extent, Zanki), who wield electric guitars. Todoroki even goes so far as to play his own guitar solos whenever he wins a battle.
Shameless Self-Promoter - Okay, it's standard procedure to advertise the series' movies every year, but aside from the end-of-episode bloopers, in episode 30, Hibiki advertises "an interesting Jidai Geki movie about seven cool men" to two elderly ladies at Tachibana. Maybe it's something else in-universe, but we spectators can't be fooled into thinking it's anything but the Seven Oni Warriors movie.
Shout-Out - the organization "Takeshi" shares a name with Takeshi Hongo (Kamen Rider 1).
And the Tachibana family that forms our heroes' primary support branch share their name with Kamen Rider 1's mentor, Tachibana Tobei. To hammer this point home, the Tachibana patriarch Ichirou appears in the Jidai Geki chapter of The Movie as someone named Tobei.
Slice of Life - With the twist that most of the cast are professional demon hunters.