Kamen Rider Kuuga's opening is an awesome theme that introduces the first Heisei Rider into the series. Senshi also kicks in when Kuuga is about to use his finishing moves.
Agito's opening, an awesome theme that describes the mystical warrior himself.
Kamen Rider Kiva had a ton of awesome tracks during its series' run, most if not all of which were sung by the actors themselves. Then, June this year, Toei released a reunion album featuring redone versions of some of the previous songs. The fact that this happened at all makes it even more awesome, as it's probably the first time it's happened to any Rider series thatisn'tDen-O.
Hibiki's first opening Kagayaki is no pushover either. It's a heroic theme that combines all of the instruments that the heroes use in the show. The second opening Hajimari No Kimi E is also a great song, having a strong orchestral theme that goes perfectly with the show's musical theme.
The Kamen Rider BLACK RX (Masked Rider in the US) intro music by Takayuki Miyauchi will get you pumped. Listen here and see if you don't find yourself singing along to the chorus. Now with a 21st Century version.
Its insert themes are no slouch either. One in particular is Shooting Star by everset, the theme for Kamen Rider Meteor.
"Awesome" is your series' middle name when one of the singers for the insert song is SherylNome with the other Yoshiharu Shiina. As exampled in GIANT STEP and COSMIC MIND.
Kamen Rider Ryuki has a very well made soundtrack for the series. The opening Alive A Life and first ending A Boundless Life both give a sense of the show's theme of survival and the ideals that Kamen Rider Ryuki believes in. The second ending Revolution is probably one of the most Hot-Blooded songs in the franchise (sung by "Kitadani Hiroshi", no less). It starts with a slow, gentle piano progression before picking up some pace and finally going into full throttle high-energy once the chorus begins.
Taking a step back to the Showa Era, while on its own, Super 1's theme may merely be stupidly catchy, This remix takes it and saturates it in Hot-Blooded goodness until it is simply drunk with it!
The opening, Justifaiz, is a great song that fits with the show's darker theme. In 2017, the show's lead actor Kento Handa made a remixed cover of the song's first verse. The arrangement better fits the depressing feel of the show as Kento/Takumi walks through a bunch of the show's filming locations, ending with finding himself still lying on the hill where the show ended.
Kamen Rider Kabuto has an energetic and fast-paced opening Next Level. The first battle theme Full Force is also a hardcore theme that goes well with Kabuto.
Kamen Rider Build has a wonderful opening song in "Be The One" by PANDORA feat. Berverly. The techno music made by PANDORA and Beverly's AMAZING singing voice combined create a catchy song that shows the ideas of determination and hope that are present in the the series.
Kamen Rider Zi-O's opening, "Over 'Quartzer'" by Shuta Sueyoshi feat. ISSA, is a catchy theme that is sung by the two singers who did the openings for Faiz and Den-O.