Takumi Inui

Takumi Inui is the protagonist of Kamen Rider 555. He's the prime user of the Faiz (Φ) gear.

Early Days
Takumi was originally a human until he died when hit by a car as a boy, resurrecting him as the Wolf Orphnoch and decided to use his newfound power to protect humans, intending to save Ryuusei School students when their reunion turned into a massacre caused by the Clover Four's Kitazaki. Since the incident, Takumi refused to transform and became a loner, bent on not getting into relationships with people out of fear of somehow betraying them, traveling without any self-confidence or lifelong dream of his own. He is also often teased by Mari for being a "nekojita" (literally means "cat tongue"; someone who cannot stand food that is too hot or cold).

Becoming Faiz
By present time, while at a restaurant, Takumi sees Mari there and follows the girl under the notion that the bag she carried was one stolen from him three days prior, demanding the bag from her when two of her travelling companions dissolved and she assumed he killed them. But when the true killer, the Orphnoch Hiroshi Izawa, reveals himself to take the Faiz Gear, Mari put the Gear on a reluctant Takumi, becoming Faiz and kills the Stingfish Orphnoch.

Once the police find his bag, Takumi ends with the Faiz Gear when he and Mari got their bags mixed, coming to her aid when she is attacked by the Elephant Orphnoch before Mari guilt trips him into sticking with her. But once learning she was faking her injuries, Takumi ditches her and causes a laundry van to crash, with Mari forced to help its driver Keitaro Kikuchi make his deliveries before finding Takumi at a laundromat.

However, when the Orphnoch bounty hunter Aoki appears, Takumi uses the Gear to kill the Ox Ophenoch with Keitaro witnessing the fight, later stealing the Faiz Gear to use it to save people. However he also cannot transform, the incident results with Orphnoch bounty hunter Akai taking the Faiz Gear and using it to his own ends until the Autovajin cancels the Faiz Gear so Takumi can reclaim it and kill the Cactus Orphnoch, deciding to keep the Faiz Gear and the Autovajin, though very apathetic towards his "duties" as Faiz when there is no immediate threat.

Arriving at Tokyo, after Mari gets no reply from her father, Takumi suggests they head to Smart Brain to find him, only to not meet Mari's guardian. But after getting a traffic fine and an ensuing argument, Mari decides to borrow money from Keitaro to pay Takumi's fine on the condition to her pay back by working part time at Keitaro's shop. Later, when the Orphnoch Eiiji Toda chases after him and Mari once killing the master at the coffee shop he worked at, Takumi admits his flaws before Keitaro arrives in time with the Faiz Gear and Takumi uses to kill the Squid Oprenoch. Deciding to help Mari, Takumi attempts to steal a Smart Brain pass from Yuji Kiba, who refuses to press charges. Later, Takumi encounters the Snake Orphnoch (Naoya Kaido) and attempts to fight him until the Horse Orphenoch (Yuji Kiba) charged in to aid him.

Eventually, Takumi was getting used to being Faiz and decided that if fighting was a sin, after losing to Kaixa a few times and battling a few Orphnoch, then he would bear the sin and defeat all that get in his way. But, after his fight with Lucky Clover member Mr. J, he loses the Faiz Gear to the Centipede Orphnoch, Itsuro Takuma. But he gets it back and is able to transform into Axel Form, thanks to Kusaka, where he manages to defeat the Sea cucumber Orphnoch and drive Takuma away. But an act of deceit from Kaido and the Rabbit Orphnoch, Yoshio Kobayashi, Takumi and Kusaka lose the belts to them as they are attacked by Takuma and a fellow Lucky Clover member, Saeko Kageyama. Takumi then did an undercover mission to get back the gears for him and Kusaka. After his cover was blown, he and Kusaka discovered the Ryuusei School inside the Smart Brain Corporation along with the Delta Gear prototype. After getting back the Faiz Gear, Takumi transforms into Faiz to battle the Lucky Clover members who have escaped.

Takumi then learns that the rest of the students of Ryuusei School used the Delta Gear also to fight. He tries to help Kaixa take out the Frog Orphnoch, but finds that it was defeated by Kamen Rider Delta. Takumi then learns that the Delta Gear was stolen by Sawada, a Ryuusei student who became an Orphnoch. The male Ryuusei School members freak out over who the belt should belong to, with Takumi puzzled by their strange behaviour. Eventually, he learns that Mari was captured by the male students who wanted to trade her life for the Delta Gear. However, Sawada arrives and kills the two students, revealing he came to discard his the last shed of his humanity by killing Mari, however Faiz and Kaixa interfere with this plan, also finding out his identity but let him escape.

Takumi then talks to Saya about being strong and able when Sawada comes back to take Mari's life. He and Kaixa team up but lose when the Dragon Orphnoch takes the belt from the newly arrived Saya (who is before killed by Sawada) and transforms into Kamen Rider Delta. Delta proves to be too much for him and Kaixa as they escape from him due to the Centipede Orphnoch (Itsuro Takuma) interfering with Delta's "fun". He then makes a vow to not leave one Orphnoch alive. He later finds the Horse Orphnoch battling the Lobster Orphnoch and becomes Faiz to take him on. However, Delta interferes and forces both Faiz and the Horse Orphnoch back into their human forms. Though astonished, Takumi eventually comes to understand Yuji's desire to protect humans and decides to fight alongside him. But Kusaka stole the Faiz Gear from Takumi in order to drive a wedge between him and Yuji (due to his personality). During this, Delta comes from out of nowhere and attacks Kaixa and Faiz and used the Jet Sliger to continue "playing". Faiz then summons his own Jet Sliger to battle Delta, but loses because of his inexperience using it. Delta then launches missiles from his Jet Sliger and destroys Faiz's Jet Sliger, but Faiz manages to escape with a quick activation of Accel mode.

Later, after talking to Mari about Sawada's humanity, he tries to believe in him and lets him protect her when she is attacked by an Orphnoch. But this was all a rouse so that he could get close to Mari to kill her like before. He succeeds in doing so and leaves Takumi in a state of shock. He asks what Kusaka meant by when he said that he will revive Mari. Sawada explained to him that she had special blood cells that normal doctors wouldn't be able to help her. Takumi talks to the Chief asking if he could use the facilities to revive Mari. The Chief agrees only if he became a member of Lucky Clover by killing Sawada to which he said is impossible for Takumi because he isn't an Orphnoch. But Takumi reveals his true nature as an Orphnoch during the fight that followed. Despite his attempt, Kusaka tells him that they cannot just ignore what that occurred.

Mari and everyone tried to have a picnic by a lake, but two Lucky Clover members wanted payment for using Smart Brain to save Mari's life. Eventually, Takumi revealed to Mari in battle that he was an Orphnoch and she was terrified at the sight of him. Later, Yuji asked him when he became an Orphnoch and about being terrified of the powers. He also mentioned to Yuji that he willingly transformed into an Orphnoch but could not remember anything after that. He tried to live with them again because Mari wanted to give him a second chance. Unfortunately, he left them of his own free will and went back to Smart Brain for some answers. It was there that the Chief of Smart Brain showed him footage of the night of the Ryuusei School Reunion; it was shown that an Orphnoch attacked the students and killed a huge number of them. The footage showed that Takumi was there in his Orphnoch form which he thought that he was responsible for what had happened. He then decided to become an official member of Lucky Clover; his first task was to take back the Faiz Gear that he gave to Yuji Kiba. The Chief wanted him to use the Gear to kill him, but Yuji refused to do it because he was human. Takumi then fled from the battle.

Once Kusaka learns that it was Takumi who slaughtered the class of Ryuusei School, he meets with Takumi with the intent to kill him. Luckily, Yuji was able to save Takumi from being killed. Takumi then found and helped Mihara and Rina by transforming into Kamen Rider Delta and fought an Orphnoch attacking them. However he faints soon after and Rina tries to show compassion, with Mihara having doubts from Kusaka. When he woke, he then decides that he would rather die than become Smart Brain's ally. He fights the Chief only to be beaten and somewhat saved by Yuji and Kusaka. He then finds out from Mari that he isn't the one who killed everyone on the night of the reunion, but the Dragon Orphnoch was responsible and that he was instead trying to protect everyone. Soon after, he becomes Faiz again but this time with a new form: Blaster Form. Using this new power he manages to destroy another Orphnoch out for his life and scare off the Dragon Orphnoch. Mari asked him to come back, with Kusaka retorting that he himself still doesn't trust Takumi (like he ever has), but refuses. He gives Mari the Faiz Gear and runs off. He then challenges the members of Lucky Clover to final battle where everything would be decided. After that, he finds that Sawada is still alive.

He eventually learns from Sawada that the attack on the Ryuusei School Reunion was not a random attack, but a plan cooked up by Smart Brain to try and artificially create Orphnoch. He also learned that most of the students were failed subjects and that only a handful survived, but only he himself became an Orphnoch. He passed out before he could tell Takumi anything else. Takumi takes Sawada to a safe location where Sawada learns why Mari can still believe in Takumi even though he's an Orphnoch before Sawada knocks him out and takes his place fighting the three members of Lucky Clover as the battle Takumi challenged to Lucky Clover. After witnessing Sawada's death, Takumi decides to fight alongside Kaixa and Delta not as an Orphnoch, but as Faiz.

After Yuji Kiba becomes president (after the first one was fired and defeated by Faiz, Kaixa, and Delta) and the death of Masato Kusaka, Takumi learns that the Orphnochs are destined to die unless the Orphnoch King is awakened. But if the King awakens, then all of humanity will die. He learns that the Orphnoch King is Teruo Suzuki and tries to destroy him to save humanity, but Kaido tried to stop him and Takumi failed. He tried again but this time Yuji stopped him and took his body back to Smart Brain for examination. He was saved by the combined efforts of Keitaro, Mari, Kaido (who found out from Yuji and told the others), Mihara, and Rina before being confronted by Yuji again. Both he and Yuji then have one last battle that involved their powers as Faiz and Kaixa and Orphnochs. Takumi is able to claim victory as he spares Yuji's life because he said that he is "human". With a renewed sense of living, Yuji agrees to help Takumi and Mihara take down the King using the power of the Gears. The fight doesn't go so well when the Kaixa Gear is destroyed and it slowly destroys Yuji. But before he died, Faiz managed to land a hit on the King, destroying him and Yuji.

During the epilogue, it's revealed that Takumi now has a dream: To make everyone in the world happy.