Kamen Rider Decade: All Riders vs. Dai-Shocker

A traveler whose memories have been erased, Tsukasa navigates a web of worlds to reclaim his past. He initiates the Rider Battle as a means to test strength and unify the Riders, while wrestling with whether his choices serve personal goals or the greater good. His journey toward reconciliation with Natsumi drives the emotional core of the story, culminating in a renewed sense of home in the Hikari Studio.

Tsukasa's sister figure in the story, Natsumi grapples with trust and abandonment as memories resurface. Her perception of Tsukasa evolves from suspicion to reluctant reliance as she faces Dai-Shocker’s threats. She becomes central to the personal stakes of the world-twisting conflict and seeks a place to belong amid the chaos.

A pivotal young ally revealed as Tsukasa's sister figure who learns of her own role within the Earth Stone’s power. Her arc moves from curiosity to realization as she discovers how manipulation and loyalty impact large-scale battles. She ultimately acts to break Dai-Shocker's control, choosing a path toward autonomy and responsibility.

A key strategist behind the scenes who embodies the manipulation and menace of the Dai-Shocker plot. He embodies a cunning, calculating presence that challenges the Riders and their plans. His actions are instrumental to the escalation toward the climactic showdown.

A formidable antagonist whose loyalties shift with the tides of Dai-Shocker’s agenda. As Shadow Moon, he embodies a dark mirror to Tsukasa’s journey, testing the heroic bonds of the Riders. His presence drives conflicts that blur lines between ally and foe and frames the final confrontations.

A complex figure whose ties to Dai-Shocker force confrontations with the Riders. His arc intersects with revenge and identity, pushing Tsukasa and friends toward critical choices about trust and destiny. His actions stall and then catalyze the climactic battles.

One half of Kamen Rider Double who arrives to bolster the Riders against overwhelming odds. His presence abroad signals the power of cross-world alliances and the unifying force of shared purpose. He contributes to decisive moments that turn the tide of the war.

The other half of Kamen Rider Double who brings intellect and support to the Rider team. His partnership with Shotaro embodies the collaboration essential to wielding multiple Rider powers against Dai-Shocker. He plays a critical role in the strategic execution of team-based victories.

A Rider whose power echoes through the World of Decade, acting as a bridge between past and present rider eras. He contributes to the ensemble’s strength as battles intensify across worlds. His presence reinforces the theme of unity across Rider generations.