This article is about a/an ally in Kamen Rider Build.

Kyoka Katsuragi (葛城 京香 Katsuragi Kyōka) is the mother of Takumi Katsuragi and one of the victims of Faust's experiments who was turned into the Strong Smash Hazard (ストロングスマッシュハザード Sutorongu Sumasshu Hazādo). Her Smash essence was used as the basis for the Lock Fullbottle.

Character History

Living in Touto, Kyoka was the mother of budding genius scientist Takumi Katsuragi, and was always disappointed by his lack of expressing if he truly cared about her despite her devotion for him. A week before Takumi's apparent death, he gave her a flash drive containing his data on Project Build, telling her to give it to someone she trusted, and a key to a safe deposit box to give to someone she didn't. She buried the drive in front of the Namba Heavy Industries Ltd. laboratory and soon moved to Hokuto. Memory Starts To Talk

She became a home-based teacher for children in Hokuto who couldn't afford school, still making Takumi's favorite meal every day as if he would return. She is eventually visited by Sento Kiryu and Ryuga Banjo, desiring them to leave until Blood Stalk attacks her students. After Sento and Ryuga fight him off, she hears Stalk say that Takumi was the founder of Faust. The Devil's Scientist

She sends the Hokuto military away with a false lead on the fugitives, listening to Sento's story and accepting that Ryuga may not have killed Takumi. She tells them her son's story and admits to them about Takumi's flash drive, deciding to bring them back to Touto to get it but not yet sure if she'll give it to them. On the way, however, she is kidnapped by Night Rogue. Gentoku Himuro bribes the safe deposit box key away from her with a false letter from Takumi and has her turned into the Strong Smash Hazard. The Smash is quickly defeated by Build FireHedgehog, but her memory of her capture has been lost because of the Nebula Gas infusion. After Sento and Ryuga retrieve the flash drive, Kyoka decides to give it to them, trusting that Sento would know what Takumi wanted done with it. Sento tells her one last thing: solving an anagram in Takumi's research reveals that he truly was grateful to her for everything, but was simply bad at expressing it. Memory Starts To Talk

It is unknown what happened to her during the war or even in the new world.

Behind the Scenes


Kyoka Katsuragi is portrayed by Hiro Komura.


  • It is unusual that her Strong Smash Hazard form gave the abiotic Lock Fullbottle, as the previous Strong Smash gave the biotic Gorilla Bottle.
    • This could possibly refer to the strength of chains, as the Lock Fullbottle also provides chain-related powers.
    • In an interesting note, the Strong Smash is known for the design motive that features a hand grabbing a rock. Both the English words for "rock" and "lock" share the same katakana pronunciation "ロック".
  • Her given name Kyoka (京香 Kyōka) is a hononym of the Japanese word for "empowerment" (強化 Kyōka). Interestingly, this also fits her Smash counterpart being an empowered variant of the original Strong Smash.


See also

External Links


Sento Kiryu (Takumi Katsuragi) - Ryuga Banjo - Kazumi Sawatari - Gentoku Himuro - Evolto - Nariaki Utsumi - Shinobu Katsuragi
Movie-exclusive: Kengo Ino - Killbus - Keiji Uraga
Transformation Gear
Fullbottles - Build Driver - Transteam Gun - (Great) Cross-Z Dragon - Sclashjellies - Sclash Driver - Hazard Trigger - Nebulasteam Gun - Cross-Z Magma Knuckle - Evol-Driver - Evol-Trigger - Grease Blizzard Knuckle - Killbuspider - Grease Perfect Kingdom
Drill Crusher - Hawk Gatlinger - 4Koma Ninpoutou - Kaizoku Hassyar - Fullbottle Buster - Steam Blade - Beat Closer - Twin Breaker - Muscle Glove - Solstall Wings - Giant Scratcher - Space Ride Arm - Spine Knuckle - Long Range Cleaner - Trash Converter - Gold Lio Gauntlet - Multi Deluge Gun
Pandora Box - Halfbodies - Fullbottle Holder - Build Phone
Vortex Finish - Hazard Level - Project Build - Sky Wall - Nebula Gas
nascita: Misora Isurugi - Soichi Isurugi - Sawa Takigawa - Kazumi Sawatari - Gentoku Himuro
Kamen Riders: Eiji Hino - Gentaro Kisaragi - Kouta Kazuraba - Takeru Tenkuji - Emu Hojo - Hiiro Kagami - Taiga Hanaya - Kiriya Kujo - Kuroto Dan - Parado - Sougo Tokiwa - Geiz Myokoin - Tsukuyomi
Prime Ministers: Taizan Himuro (Touto) - Yoshiko Tajimi (Hokuto) - Masakuni Mido (Seito)
Namba Heavy Industries Ltd.: Juzaburo Namba - Nariaki Utsumi - Haruhiko Wanibuchi - Guardian
Hell Bro's: Fu Washio - Rai Washio - Yoshikazu Takahashi - Norio Matsui
Aliens: Vernage
Gentoku Himuro - Evolto - Nariaki Utsumi - Takumi Katsuragi - Shingo Kuwata - Eita Kawai - Yoshikazu Takahashi - Norio Matsui
Touto: Needle Smash - Strong Smash - Burn Smash - Flying Smash - Mirage Smash - Square Smash - Press Smash - Ice Smash - Stretch Smash
Hokuto: Castle Hard Smash - Stag Hard Smash - Owl Hard Smash
Kaiser: Kaisei Mogami (World of Ex-Aid)
Kengo Ino - Ryoka Saiga - Mitsuomi Gobara - Evolto - Killbus
Keiji Uraga - Simon Marcus (Phantom Crusher)
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