Kadoya Tsukasa

The main character of Kamen Rider: Decade, a guy who travels dimensions and appears as a normal person in them. Kamen Rider lore is hard.

Season 3
Now his travels across realities have lead him to yet another new world thanks to the dimensional merge, The World of The Final Rumble, in this new world he appears a wrestler in TFR 's ring. Intrigued, he wants to learn more about this world, find the Rider(s) that reside in it, try to do good, and ultimately, decide if it's bears danger to other universes and destroy it if it does so.

Episode 9

Debuts in a rumble trying to pass as another wrestler.

Off-Season 3
Fights a match against other heroic individuals, but doesn't quite get the hang of wrestling.

Season 5
Feeling a strange attraction to TFR like something is happening, he returns to the ring.

Season 6
After the tragedy, Kadoya is now sure he must destroy this world

Episode 2

Turns Chosen Hunter into a yugioh card after BTFOing him in the ring.

Episode 3

Confronted by Mitake Miyao under suspicion of killing his father, he admits he must destroy this world. Kadoya cryptically answers that he remembers everything now after the King of Hell rose up. Miyao attacks him after he spews nonsense, but he just says that he can't defeat the one destined to destroy everything. Miyao is defeated after a hard fought match. However Kadoya spares him...

His rider decade form is in fact his persona.

Episode 4

Miyao confronts Kadoya again and questions why Kadoya spared him. Kadoya explains that he believes Miyao is just a naive kid that doesn't know any better. Kadoya mulls over his own inability to destroy nor save the world and what he holds dear, but is convinced by Miyao to help his friends go against their destiny and to assist in their efforts to change the world and help find his friends. Even thought Kadoya points out that the two traitors are ready to put a finishing blow on Rando, Miyao instructs Komaeda to go find Tatsuya and Makoto, and Kadoya gives up on stopping such a strong will.

After Broken Man goes on to face BANS, Kadoya, Makoto, Tatsuya and Komaeda are the last ones remaining. Kadoya keeps clearing the way as they run for the exit, but the tremors keep intensifying. However, after BANS' match ends, it's already too late. Kadoya desperately tries one last thing as the rumbling grows to its tipping point. Episode 5

He and his group arrive in the diamond realm and meet Yasuhiro Hagakure who offer them Jah's blessings to get stronger after defeating certain apparitions in the area.

Reveals himself to be an alternate Suou Tatsuya who received assistance from a complex individual to travel to this new world to stop the events of Battler/47's altercation and the rumbling from happening but failed when his memories became muddled during the merging dimensions events.

In order to receive the last Jah's blessing to get stronger, he fights Tatsuya for the right to have it but is defeated by his other self.

The group then travels to the world of TFR twelve years into the future and catch up the situation of the resistance. They decide to watch various qualifier matches of their aged peers that are fighting over spots on the resistance raid teams.

Episode 6

As they go to the raid on Tazuna Industries, Tatsuya and Kadoya are tasked with cleaning up the front. Tatsuya wonders how Kadoya's life was during those 12 years, but before he can give it, a familiar roar resonates: They end up against a team of monsters, but defeat them.

Episode 8

As they rest and wait for the raid on Ruber's Castle to end, Tatsuya bullies Kadoya about wearing glasses and wonders if his taste will get that bad in 12 years. Feeling useless about the situation, Kadoya says he trusts Central but they need to move faster. Makoto wonders what they can do without Komaeda, but Kadoya heard of the fire in his eyes when beating up Sweet Tooth, and comments that Tatsuya could learn from him, as they are one and the same. Just then, Tatsuya receives a message: it's Komaeda waiting in a city cafe.

...honk. Take my bloon.

Episode 9

Makoto, Kadoya and Tatsuya go to the raid into The Factory.

As they are exploring the back area, the sound of a motorcycle resonates, and Tatsuya is taken to a fiend's realm where he is sentenced to 10 pure strikes. Kadoya and Makoto hurry up and go to search for him.

As they search, they hear screaming from the basement area, and find The Circus beating up Tatsuya. Makoto and Kadoya move in to fight, but Makoto tells him to take Tatsuya and run for it, if Kadoya sacrified everything to come to this timeline and save them, then he will do the same. Makoto closes the door after Kadoya drags Tatsuya, and guards it with his life.

Episode 10
As Kadoya makes his way to HQ from visiting Tatsuya at the hospital, he notices the guys entering it are members from The Three Kings' forces. He remembers on how he tried advert Central that this could happen, but apparently he wasn't paying attention. Trying to avert such a future from happening again, Kadoya sneaks around a fat monster, when he spots Robo Jensen shutting down the facility with the controls. He steps in and they engage in a fight. Jensen shoots Kadoya in the chest...

Somehow still alive, Kadoya drags himself with all his willpower into the controls and with the last of his strength opens the gates, allowing people to escape. Tatsuya arrives sometime later being discharged from the hospital, finding the place has been vacated, and finds Kadoya struggling to stay alive.

He rushes and picks him up in his arms, and wonders, just why they couldn't destroy this fate...? But... even if he couldn't change everything, he could defy destiny... in his history, not a single person was let alive... this is where timelines diverge. Kadoya closes his eyes. It's all on Tatsuya now.

Episode 15

As Tatsuya's friends lie on the ground and the clowns move in to finish them, Kadoya's voice resonates within Tatsuya and encourages him to defy his destiny, and summoning Kadoya's Kamen Rider Persona, he wills himself to stand up and protect everyone. Casting Deadly Burn on JOKER starts to burn away his mask, and the sheer force of his determination in his eyes is enough to scare even the clowns into fleeing. Clownmaeda stares at him and smiles, saying that he's glad he could embolden his hope, and that the world's fate is up to him.

Episode 17

Katsuya's wishes are able to reach Tatsuya against Nyarlathotep when he takes the summoning key. Humanity's collective wishes make him drop the key and Tatsuya uses it to seal finish him, forever.

Season 0
After somehow reincarnating in the new universe despite not being originally from the previous one, Kadoya ends up opening Survive Bar, named after having survived something which can only be attributed to a miracle, while keeping his real identity a secret.

Episode 4

Kiryu Kazuma and Suou Katsuya have a short meeting at the Survive Bar.

Episode 7

Katsuya and Ooishi Kuraudo visite the bar. After they order, The Bartender offers them the drinks on the house for "No specific reason. You could say I just felt like it.".