Katsumi Daido

Kamen Rider Eternal is a Kamen Rider and the primary antagonist in Kamen Rider Double Forever: A to Z/The Gaia Memories of Fate.

Katsumi Daido
Katsumi Daido is the leader of the organization NEVER that distributes the T2 Gaia Memories. He leads the Dopants created from the T2 Gaia Memories to attack Futo City.

Kamen Rider Eternal
Through the Lost Driver and the T2 Eternal Memory, Katsumi transforms into Kamen Rider Eternal. Eternal's Maximum Drive is the Eternal Requiem (エターナルレクイエム, Etānaru Rekuiemu) Rider Kick. Like most Riders in Kamen Rider Double, Eternal has an English letter motif, in this case the letter E. Eternal is also adorned with a black cape after transformation. His catchphrase is "Now, enjoy Hell" (さあ、地獄を楽しみな, Sā, jigoku wo tanoshimina).

Strengthening Armanent
By filling all 26 of his Memory Slots, Eternal enters his Strengthening Armament (強化武装, Kyōka Busō) mode. In this mode his cape is discarded and can execute the Never Ending Hell (ネバーエンディングヘル, Nebā Endingu Heru) Maximum Drive.

Lost Driver
The Lost Driver is a seond generation Memory Driver belt originally used by Kamen Rider Skull. To transform Daido puts the T2 Eternal Memory into the Memory Slot and undergoes the transformation.

Maximum Slots
In addition to the Maximum Slots on the Lost Driver and the Eternal Edge, Kamen Rider Eternal has a series of Maximum Slots on belts around his chest, right arm, and left leg, for a total of 26 for every T2 Gaia Memory.

Gaia Memory
Eternal's main T2 Gaia Memory is the Eternal Memory which is used for the transformation and Maximum Drive, though he can use all of the other T2 Gaia Memories due to all of the Maximum Slots he owns, as shown in a magazine scan.

Eternal Edge
The Eternal Edge is a combat knife that is summoned through the powers of the Eternal Memory. When the Eternal Memory is placed in the weapon's Memory Slot it initiates the Bloody Hell Blade Maximum Drive.