Lockseeds are special devices used in the Kamen Rider Gaim series, which is part of the larger Kamen Rider franchise. They resemble fruit and are used by the characters to transform into armored warriors known as Kamen Riders. Each Lockseed contains unique powers and abilities, often inspired by different types of fruit. In the series, Lockseeds are activated by inserting them into a device called the Sengoku Driver. This process allows the user to harness the energy of the Lockseed, granting them enhanced strength and special attacks. Collecting and using various Lockseeds is a central theme in the storyline.