Yuto Sakurai/Past Man

The "Past Man" (過去の男 Kako no Otoko) is a mysterious figure that appears in times in the past when Imagin appear who are out to get him.

Plot and Overview
He has a Seiko pocket watch that has the phrase "The past should give us hope" on the back etched on it. He wears a trenchcoat and many caps. When Ryotaro bumps into the "Past Man" at one point, he saw that he was the Yuto Sakurai he knew: Airi's fiancé who mysteriously disappeared and is believed to be dead. Ryotaro remembers him as a kind figure who was into astronomy and loved Airi's coffee, and as such, almost considered him family. As he is Yuto's future self, Sakurai has access to the Zeronos arsenal. Eventually, the memory of Sakurai is completely erased from mostly everyone within Ryotaro's time. This happens because Sakurai provided Deneb with the first set of Zeronos Cards Yuto uses at the cost of his future self's existence, with the final Zeronos card presented to Yuto in the final battle completely erasing him from time, although Airi is confident that her love will return to her in time.

Kamen Rider Zeronos
Altair Form is the default form of Zeronos, using the Zeronos Cards to evoke the change. It is named after the star Altair in the constellation Aquila the Eagle. The "mask" is made up of two green bull's head-shaped visors, the same motif as Zero-Liner Drill, which is based on the mythological occupation of Altair as a cowherd. These form from two bull's head-shaped train cars that ride along the tracks on Zeronos' helmet. The rest of the body has a set of converging train tracks that are almost like a zipper. Altair Form has generally balanced abilities comparable to Den-O's Sword Form. When Yuto becomes Altair Form, he says, "I'll tell you this for starters…" (最初に言っておく…)followed by something that concerns Yuto's strength or how annoyed he is. After using the Red Zeronos card, Yuto's own memories were used to cause Altair Form to "rust", changing it into Zero Form, although the future Yuto Sakurai is still able to assume Altair Form. In the final fight, Yuto once again uses this form using the last of original Zeronos cards. Later during the investigation of Negataros, Yuto returns with a new set of Zeronos cards, able to assume Altair Form once again.
 * Rider height: 192cm
 * Rider weight: 89kg
 * Ability perimeters:
 * Punching power: 5t
 * Kicking power: 7t
 * Maximum jump height: 35m
 * Maximum running speed: 100m/5s