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This article is about a/an 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, Ixa, Accel, Fourze, and Beast) are perfectly capable of holding their own in their Base Forms, others (Kuuga, Ryuki, and Den-O) Base Forms are rather weak in comparison to their other forms.

Kamen Rider Agito

Kamen Rider Den-O

Kamen Rider Kiva

  • Kamen Rider Kiva
    • Kiva Form - Must be assumed before accessing an Arms Monster form

  • Kamen Rider Ixa
    • Save Mode - Ixa's default form before activating Burst Mode and, by extension, Rising Ixa.

Kamen Rider Fourze

Kamen Rider Wizard

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

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

Kamen Rider Ex-Aid

  • Kamen Rider Brave
    • Quest Gamer Level 1 - Brave's default form accessed upon inserting the Taddle Quest Gashat. Must be assumed before accessing a Level 2-5, Level 0, or Legend Game form.

Kamen Rider Zi-O

Kamen Rider Zero-One

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