Through the Lostdriver and the Eternal Memory, Katsumi transforms into Kamen Rider Eternal. Like most Riders in Kamen Rider W, Eternal has an English letter motif - in this case the letter 'E'. Katsumi originally transformed using the standard Eternal Memory, but it was disabled after the battle with the Eyes Dopant and he was forced to abandon it. This form is also called Eternal Blue Flare (ブルーフレア, Burū Furea), as revealed in Kamen Rider W Returns, and is more powerful than the incomplete Red Flare form due to Katsumi's high compatibility with the Eternal Memory. Between the Maximum Slots on the Lostdriver, Eternaledge, and the Max Belts strapped across his body, Eternal can use all 26 T2 Gaia Memories at the same time.

Red Flare (, Reddo Furea) is Eternal's incomplete form. This form of Eternal was accessed by Jun Kazu, who could not access the full power of the Eternal Memory due to his poor compatibility with it. Unlike its Blue Flare version, it lacks the extra Memory Slots and Eternal Robe, and the flame designs on the arms and leg bands are red instead of blue. In W Returns, Katsumi briefly transforms into Red Flare before it evolves into Blue Flare due to his high compatibility.

#KamenRider #Eternity