Naoya Kaido

Naoya Kaido (aka Snake Orphnoch) is the third member of Kiba's trio in Kamen Rider 555.

Personality & Character
He is a young man with an overly eccentric personality prone to incredibly fast speeches and constant mood swings; it's possible he suffers a form of ADD. Kaido is often inconsiderate and selfish, but he's always been straight-up and honest about his feelings with people in his life. His greatest past-time is to play his guitar, but due to his hand injury, it often reminds him of the regrets he had as a human.

Skills & Abilities
In his human form, Kaido can ride a bike and skilled in playing the guitar. He was considered a prodigy musician before his hand was crippled. In his Orphnoch form, he is themed after a venomous snake. He has never revealed his second Orphnoch form, but he can spit acidic venom at his opponents and has great physical strength.

TV Series
He played the guitar in his younger days, but sabotage from his teacher destroyed some of the motor-skills in his left hand, forcing him to abandon his music. He is later made a 'sired' Orphnoch by Toda as an example to Kiba and Yuka of how Orphnoch must make allies, using a snap of his finger to trigger his transformation into Snake Orphnoch (スネークオルフェノク Sunēku Orufenoku?). Learning of the changes after his enhanced ability to smell cost him a part-time job and being targeted by a corrupt employer, Kaido decides to abuse his power for personal gain when he encountered Faiz, with Kiba coming to his aid.

He greatly mistreats Yuka accidentally due to her crush on him. Continuing to struggle with his nature as an Orphnoch, Kaido ends up living with Kiba and Yuka, although he is the least concerned about protecting humans. At times he sides with Smart Brain over Kiba and Yuka, but his powerful and soft-hearted conscience often stops him from committing heinous acts at the last second. He eventually develops a partnership with Keitarou, which results in many harebrained schemes to win the respected woman of their desire, and bonded with Teruo. He briefly wore one of the six Riotrooper gears under Kiba's term in Smart Brain, the two switched roles, with Kaido throwing away his Riotrooper belt at Kiba out of disgust for his friend's new attitude.

Kaido would later save and befriend a orphaned boy, Teruo Suzuki, from a fire. Little did he know it's the future Orphnoch King. Eventually, Kaido's and his friends eventually figured out that Terou is the messiah the Orphnochs has been waiting for and the Kamen Riders face them in a final epic battle. Unfortunately, he was the only survivor as Kiba held down the Orphnoch King for Faiz Blaster to defeat. His fate is unknown, his fate was never told, only that he decided to live the rest of his days as human.

Lost Paradise
In the movie, Kaido, Yuka, and Kiba was on humanity's side. However, the humans didn't trust the Orphnnochs and demanded proof of their loyalty by sabotaging Smart Brain. Unfortunately, it was a trap by Smart Brain and the trio was brutally defeated by Smart Brain's most powerful creation, the Elasmotherium Orphnoch. Yuka was mortally wounded and Kaido tended to her as she faded away. It was in their final moments that Kaido confessed his love for Yuka. Not long after Yuka expired, Kaido ran a suicide attack and was eaten alive by the Elasmotherium Orphnoch. Kiba, being the only survivor was recovered, but also tricked into thinking that it was the humans that deceived them and vowed revenge for his friends.