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Icon-krThis article is about a recurring plot element in the Kamen Rider Series.

In certain Kamen Rider Series, there are Riders who have access to a default form before they alternate between their Main Forms. Usually the Rider's default form is commonly used along with the other Main Forms, while some other riders include a base that gives access to alternate forms that offer slight advantages over the base form, such as added strength in return for lowered speed, etc.

The combat capabilities of Base Forms vary. While some riders (Agito, ZECT Riders, Ixa, Accel, Fourze, and Beast) are perfectly capable of holding their own in their Base Forms, other Riders' (Den-O) Base Forms are rather weak in comparison to their other forms.

Kamen Rider Agito[]

  • Kamen Rider Agito
    • Ground Form - Must be assumed before before Flame, Storm, and Trinity Forms.
    • Burning Form - Accessed before Shining Form

Kamen Rider Kabuto[]

Kamen Rider Den-O[]

Kamen Rider Kiva[]

  • Kamen Rider Kiva
    • Kiva Form - Acts as a base for Arms Monster forms and must be assumed before accessing them.
    • Emperor Form - Must be assumed before accessing DoGaBaKi Emperor Form

  • Kamen Rider Ixa
    • Save Mode - Ixa's default form before activating Burst Mode or accessing Rising Ixa

Kamen Rider Fourze[]

Kamen Rider Wizard[]

  • Kamen Rider Wizard
    • Flame Dragon - Acts as a base for All Dragon and must be assumed before accessing it.
    • Infinity Style - Acts as a base for Infinity Dragon and must be assumed before accessing it.

  • Kamen Rider Beast - Beast must assume this form before summoning a Mantle or accessing Hyper Beast.

Kamen Rider Gaim[]

Kamen Rider Drive[]

  • Kamen Rider Drive
    • Type Speed - Must be assumed before performing a Tire Exchange.
    • Type Wild - Must be assumed before performing a Tire Exchange.
    • Type Technic - Must be assumed before performing a Tire Exchange.
    • Type Dead Heat/Dead Heat Drive - Must be assumed before performing a Tire Exchange.
    • Type Formula - Must be assumed before performing a Tire Exchange.

  • Kamen Rider Mach - Must be assumed before performing a Signal Exchange or Tire Exchange.
    • Dead Heat Mach - Must be assumed before performing a Signal Exchange or Tire Exchange.

Kamen Rider Ex-Aid[]

  • Kamen Rider Ex-Aid
    • Action Gamer Level 1 - Must be assumed before accessing a Level 2-5, Level 0, or Legend Game form.
    • Double Action Gamer Level X - Must be assumed before accessing a Level XX.
    • Maximum Gamer Level 99 - Must be assumed before accessing Muteki Gamer.

Kamen Rider Build[]

  • Kamen Rider Build
    • RabbitTank Hazard Form - Acts as a base for RabbitRabbit and TankTank Forms and must be assumed before accessing them.

Kamen Rider Zi-O[]

  • Kamen Rider Zi-O - Acts as a base for all Armor forms.
    • DecadeArmor - Acts as a base for Forms accessed by inserting another Ridewatch into the Decade Ridewatch.

Kamen Rider Zero-One[]

Kamen Rider Saber[]

  • Kamen Rider Saber
    • Brave Dragon - Acts as a base for other main forms and Wonder Rider forms.
    • Primitive Dragon - Acts as a base for Elemental Dragon.
    • Xross Saber - Acts as a base for other forms using the Haouken Xross Saber.

  • Kamen Rider Blades
    • Lion Senki - Acts as a base for other main forms and Wonder Rider forms.

  • Kamen Rider Espada
    • Lamp Do Alangina - Acts as a base for other main forms and Wonder Rider forms.

  • Kamen Rider Buster
    • Genbu Shinwa - Acts as a base for other main forms and Wonder Rider forms.

  • Kamen Rider Kenzan
    • Sarutobi Ninjaden - Acts as a base for other main forms and Wonder Rider forms.

  • Kamen Rider Slash
    • Hanselnuts to Gretel - Acts as a base for other main forms and Wonder Rider forms.

Kamen Rider Revice[]

  • Kamen Rider Revi
    • Rex Genome - Acts as a base for Ultimate Revi
    • Barid Rex Genome - Acts as a base for Volcano Rex Genome

Kamen Rider Geats[]

  • Kamen Rider Geats
    • Entry Raise Form - Acts as a base for forms accessed using Raise Buckles.
    • Raising Form - Acts as a base for Command Form and must be assumed before accessing it.
    • Boost Form MarkII - Acts as a base for LaserBoost Form.

Kamen Rider Gotchard[]

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