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He and his sister, Selena Sprocket were in a car accident caused by him, but the brunt of the blame was placed on their servant, Dumas Gloomsbury. They were both injured severely, and Selena asked Pierce Nichody to save Sorin's life, even if it was at the cost of hers. Sorin survived, but not without problems. Afterwards, he was diagnosed with anterograde amnesia, and was not able to create new memories. To counter this, he carried around a notebook with him everywhere he went, writing notes to remember.
Haguruma (歯車) means "gear," referencing his job as an engineer and his steampunk-esque aesthetic.
Raito is a loanword derived from the words light and right, the latter of which reference the Wright brothers. Raito is also the Japanese pronunciation of the English word "light", referencing his sister's Japanese name, Hikari, which is derived from the Japanese word for light, hikari.
Sorin comes from the word "soaring" and a "sprocket" is a gear, referencing his Japanese name.
Sprocket may also plays on "rocket", which refers to him using his jetpack during his breakdown.