This is a list of Kamen Rider forms that are depicted in concept art, but have yet to make an official appearance in any media.
Kamen Rider ZO
- Kamen Rider ZO
- Upgraded Form
- Senior Rider Remodeled ZO
- New ZO
Kamen Rider Ryuki
Kamen Rider Decade
- Riderman (A.R. World)
- Riderman suit
Kamen Rider OOO
- Kamen Rider OOO
- Takayadoba
- Bikaso Combo
- Shigazeshi Combo
- Seishirogin Combo
- Saramiuo Combo
Kamen Rider Gaim
Kamen Rider Build
- Kamen Rider Build
- GoldScorpion Form
- MomotarosDensya Form
- TanteiUSB Memory Form
- TakaMedal Form
- YujouRocket Form
- MahoutsukaiDiamond Form
- OrangeLock Form
- ObakeParka Form
- Kamen Rider Evol
- Black Hole Form Feverflow Mode (Ultimate Body)
Kamen Rider Zero-One
- Kamen Rider Zero-One
- Shooting Wolf
- Punching Kong
- Rushing Cheetah
- Sparking Giraffe
- Amazing Hercules
- Sting Scorpion
- Lightning Hornet
- Gatling Hedgehog
- Exciting Stag
- Crushing Buffalo
- Trapping Spider
- Storming Penguin
- Splashing Whale
- Amazing Caucasus
- Scouting Panda
- Burning Falcon
- Fighting Jackal
- Invading Horseshoe Crab
- Kamen Rider Vulcan
- Rising Hopper
Kamen Rider Saber
- Kamen Rider Saber
- Storm Eagle
- Saiyuu Journey
- Dragon Kiring
- Dragon Butasan
- Dragon Ninja
- Dragon Alangina
- Dragon Hansel
- Dragon Usakame
- Dragon Houshin Engi
- Dragon Issun
- Dragon Jizou
- Dragon Kaguyan
- Dragon Hedgehog Alangina
- Dragon Hedgehog Jackun
- Dragon Hedgehog Arthur
- Dragon Hedgehog Butasan
- Dragon Hedgehog Kirin
- Dragon Hedgehog Ninja
- Dragon Hedgehog Hansel
- Dragon Hedgehog Bremen
- Dragon Hedgehog Saiyuu
- Dragon Hedgehog Usakame
- Dragon Hedgehog Sarukani
- Dragon Hedgehog Houshin Engi
- Dragon Hedgehog Issun
- Dragon Hedgehog Jizou
- Dragon Hedgehog Kaguyan
- Dragon Lion
- Dragon Lion Alangina
- Dragon Lion Jackun
- Dragon Lion Peter
- Dragon Lion Arthur
- Dragon Lion Butasan
- Dragon Lion Kirin
- Dragon Lion Ninja
- Dragon Lion Hansel
- Dragon Lion Bremen
- Dragon Lion Saiyuu
- Dragon Lion Usakame
- Dragon Lion Sarukani
- Dragon Lion Houshin Engi
- Dragon Lion Issun
- Dragon Lion Jizou
- Dragon Lion Kaguyan
- Dragon Eagle Alangina
- Dragon Eagle Jackun
- Dragon Eagle Peter
- Dragon Eagle Arthur
- Dragon Eagle Kirin
- Dragon Eagle Ninja
- Dragon Eagle Hansel
- Dragon Eagle Bremen
- Dragon Eagle Usakame
- Dragon Eagle Sarukani
- Dragon Eagle Houshin Engi
- Dragon Eagle Issun
- Dragon Eagle Jizou
- Dragon Eagle Kaguyan
- Kamen Rider Blades
- Tenkuu no Pegasus
- Peter Fantasista
- Dragon Lion
- Dragon Lion Alangina
- Dragon Lion Jackun
- Dragon Lion Peter
- Dragon Lion Arthur
- Dragon Lion Butasan
- Dragon Lion Kirin
- Dragon Lion Ninja
- Dragon Lion Hansel
- Dragon Lion Bremen
- Dragon Lion Saiyuu
- Dragon Lion Usakame
- Dragon Lion Sarukani
- Dragon Lion Houshin Engi
- Dragon Lion Issun
- Dragon Lion Jizou
- Dragon Lion Kaguyan
- Genbu Lion
- Genbu Lion Alangina
- Genbu Lion Jackun
- Genbu Lion Peter
- Genbu Lion Arthur
- Genbu Lion Butasan
- Genbu Lion Kirin
- Genbu Lion Ninja
- Genbu Lion Hansel
- Genbu Lion Bremen
- Genbu Lion Saiyuu
- Genbu Lion Usakame
- Genbu Lion Sarukani
- Genbu Lion Houshin Engi
- Genbu Lion Issun
- Genbu Lion Jizou
- Genbu Lion Kaguyan
- Lion Alangina
- Lion Jackun
- Lion Arthur
- Lion Butasan
- Lion Kirin
- Lion Ninja
- Lion Hansel
- Lion Bremen
- Lion Saiyuu
- Lion Usakame
- Lion Sarukani
- Lion Houshin Engi
- Lion Issun
- Lion Jizou
- Lion Kaguyan
- Pegasus Lion Alangina
- Pegasus Lion Jackun
- Pegasus Lion Arthur
- Pegasus Lion Butasan
- Pegasus Lion Kirin
- Pegasus Lion Ninja
- Pegasus Lion Hansel
- Pegasus Lion Bremen
- Pegasus Lion Saiyuu
- Pegasus Lion Usakame
- Pegasus Lion Sarukani
- Pegasus Lion Houshin Engi
- Pegasus Lion Issun
- Pegasus Lion Jizou
- Pegasus Lion Kaguyan
- Jaaku Dragon Lion
- Jaaku Dragon Lion Alangina
- Jaaku Dragon Lion Jackun
- Jaaku Dragon Lion Peter
- Jaaku Dragon Lion Arthur
- Jaaku Dragon Lion Butasan
- Jaaku Dragon Lion Kirin
- Jaaku Dragon Lion Ninja
- Jaaku Dragon Lion Hansel
- Jaaku Dragon Lion Bremen
- Jaaku Dragon Lion Saiyuu
- Jaaku Dragon Lion Usakame
- Jaaku Dragon Lion Sarukani
- Jaaku Dragon Lion Houshin Engi
- Jaaku Dragon Lion Issun
- Jaaku Dragon Lion Jizou
- Jaaku Dragon Lion Kaguyan
- Cerberus Lion
- Cerberus Lion Alangina
- Cerberus Lion Jackun
- Cerberus Lion Peter
- Cerberus Lion Arthur
- Cerberus Lion Butasan
- Cerberus Lion Kirin
- Cerberus Lion Ninja
- Cerberus Lion Hansel
- Cerberus Lion Bremen
- Cerberus Lion Saiyuu
- Cerberus Lion Usakame
- Cerberus Lion Sarukani
- Cerberus Lion Houshin Engi
- Cerberus Lion Issun
- Cerberus Lion Jizou
- Cerberus Lion Kaguyan
- Kamen Rider Espada
- Tri Cerberus
- Needle Hedgehog
- Eagle Alangina
- Lion Alangina
- Lamp Do Cerberus
- Cerberus Eagle Alangina
- Cerberus Lion Alangina
- Cerberus Hedgehog Alangina
- Dragon Alangina
- Dragon Hedgehog Alangina
- Dragon Lion Alangina
- Dragon Eagle Alangina
- Genbu Alangina
- Genbu Hedgehog Alangina
- Genbu Lion Alangina
- Genbu Eagle Alangina
- Pegasus Alangina
- Pegasus Eagle Alangina
- Pegasus Hedgehog Alangina
- Pegasus Lion Alangina
- Jaaku Dragon Alangina
- Jaaku Dragon Eagle Alangina
- Jaaku Dragon Lion Alangina
- Jaaku Dragon Hedgehog Alangina