Philip

Philip (フィリップ, Firippu) is the right sided-half of Kamen Rider Double. He is a mysterious young man who works as Shotaro Hidari's partner after he and Detective Narumi save him from an experiment conducted by the Sonozaki Family. Being an avatar to the true Gaia Memory, he has full access to the Gaia Library, which he often interfaces with to look up for information on Dopants, and has computational capabilities comparable to that of a supercomputer. He fights Dopants with Shotaro, projecting his mind into Shotaro's body to form the right half of Kamen Rider Double. Philip represents the mind of Double.

History
He is a mysterious young man who possesses the true Gaia Memory (地球の記憶). His real name is Raito Sonozaki (園咲 来人, Sonozaki Raito), the 3rd born child of Ryubee, whose mind was altered by Satoshi Yamashiro under his father's wishes to have no memory of his name and family. It is also revealed to him that Raito actually died twelve years ago in a freak accident falling into a well connecting to the true Gaia Memory, but he was somehow revived as an avatar almost instantaneously. After being rescued by Shotaro and Sokichi Narumi from a mysterious organization, Philip helps investigate Dopant activity through his ability to access the Gaia Library (地球（ほし）の本棚), a collection of all of the information in the known world. However, due to having no memory of his life before being rescued and the need to keep his location secret from the people Shotaro rescued him from, he usually spends his time in the Detective Agency's secret hangar, reading about common topics that he finds interesting. He fights the Dopants with Shotaro as the mind and soul of Kamen Rider Double, providing the Gaia Memories for the right side of Double.

After being thrown into the Gaia Memory for the Gaia Impact and extracted from ClayDoll Xtreme, Philip's body became unstable to the point that should he transform into Kamen Rider Double, again, he would break up into data and completely be absorbed by the planet. Saving their final transformation to save Wakana and fight the Utopia Dopant, Jun Kazu, Philip has Shotaro promise to him that he will still fight for Futo even if he is gone. After Kazu is defeated, Philip bids his final farewell to Shotaro as he fades away once the transformation is ended. Before he left, Philip left Shotaro a gift containing a Lost Driver belt and the blank book he used to access the Gaia Library containing a message thanking Shotaro and asking him to continue to protect Futo. A year later, after Wakana learns that Philip sacrificed his own physical existence to save her, she initiates her own Gaia Impact to bring back the Xtreme Memory which slowly reconstructs Philip's physical body. Before returning, Philip has one last moment with his family who tell him that they will be watching over him. Upon returning to physical form, he continues to protect the city of Futo as Kamen Rider Double.

Personality
At first, Philip was shown to be completely devoid of interest in human relationships, even calling himself 'a little devil'. Being extremely intelligent, he is mostly apathetic and shows interest only in common topics he finds interesting which he reads occasionally, sometimes even turning into an obsession that overwhelms him until he knows everything about that subject, often getting in the way of ongoing investigation. At times even going to extremes where he work himself out until he collapses, such as when he was reading on weight-loss, and getting himself very fat after getting obsessed with Mochi, a type of rice cake. After that, he would completely lose interest in the said topic and move on to something else. Being apathetic and have little experience in interacting with people, he is seen to be a cold person who would often annoy people around him with cold hard facts presented in a completely tactless manner.

After spending time with Shotaro and Akiko, Philip's human and emotional side starts to surface and develop, and over time, he came to love Futo and the friends he and Shotaro made. He also playfully teases Shotaro about being 'half-boiled', (which is by the way a truth most of the time) while still being his most trustworthy friend. Being confined most of the time to a room doing researches, both before and after being rescued, he does not get to exercise much and as such, he is visibly physically weaker that Shotaro. The FangJoker transformation, which uses his body instead of Shotaro's, thus take a severe toll on him should he sustain the transformation for extensive periods.

Philip maintained a close relationship with Wakana Sonozaki after helping her in the Violence Dopant case, which was further enhanced when he discovered his identity as Raito Sonozaki until Wakana was convinced to join in the Gaia Impact plan. He became devoted to bring his family out of their Gaia Memory plans so that they can be a true family again, even if it meant disappearing forever.

Gaia Memories
The Gaia Memories (ガイアメモリ) are mysterious USB flash drives imbued with the powers of the Earth itself. Originally created with funding by the Sonozaki Family, these Gaia Memories end up in the possession of Shotaro and Philip, and can only be used through the Double Driver. Two can be inserted into the Double Driver, allowing Shotaro and Philip to transform into Kamen Rider Double. Philippe's right-half Gaia Memories called Soul Memories (ソウルメモリ) determine the elemental power of Double, while Shotaro's left-half Memories called Body Memories (ボディメモリ) determine the type of attack or weaponry that Double uses.


 * Cyclone Memory (サイクロンメモリ): The Cyclone Memory, also known as the Windy Memory (風の記憶), allows the user to move at fast speeds, controlling the very power of wind, becoming the Windy Warrior (風の戦士). When used, half of Kamen Rider Double becomes the green Cyclonic Right Half (旋風の右半身). Forms using the Cyclone Memory possess a silver cape-like cloth hanging from the neck.


 * Heat Memory (ヒートメモリ): The Heat Memory, also known as the Hot Memory (熱き記憶), empowers the user with the powers of the element of fire, becoming the Blazing Warrior (炎の戦士). When used, half of Kamen Rider Double becomes the red Heated Right Half (熱きの右半身).


 * Luna Memory (ルナメモリ): The Luna Memory, also known as the Illusion Memory (幻想の記憶), allows the user to cast illusions, stretching limbs and bending gunshots, becoming the Mysterious Warrior (神秘の戦士). When used, half of Kamen Rider Double becomes the yellow Fantastical Right Half (幻想の右半身).

Fang Memory
The Transforming Gaia Dinosaur Fang Memory (変形ガイア恐竜ファングメモリ), also known as the Fanged Memory (牙の記憶, Kiba no Kioku), is a special GaiaMemory that was solely created to protect Philip by any means necessary, enabling him and Shotaro to transform into Kamen Rider Double FangJoker. It can change between its Live Mode (ライブモード), which resembles a Dromaeosaurid, and its Memory Mode (メモリモード), the top of which resembles a dinosaur's head. When used, half of Kamen Rider Double becomes the white Fanged Right Half (牙の右半身), enabling Double to fight like a berserker while altering the left half to match it in being animalistic in design. Being made to protect Philip, the Fang Memory will only show up whenever he or anyone in his vicinity is in danger. Unlike the normal transformations into Kamen Rider Double, this transformation is initiated by Philip and the process causes Shotaro to fall comatose and transfer his mind until they revert back to normal.

Trivia

 * Philip was named by Sokichi Narumi after the fictional detective Philip Marlowe.
 * His name is alternatively spelled as "Philippe" in the aura that is produced when he accesses the Gaia Library.
 * His real name "Raito" is pronounced similarly and is also the katekana of the English word "right",as he forms the right side of any Kamen Rider Double formation.