Hajime Katsura

Hajime Katsura (桂 はじめ) is Rei Katsura's younger brother. He was kidnapped by Leviathan for the intent of forcing him to create an Appmon.

Appearance
Hajime is a young boy with short brown hair and blue eyes. He wears a white shirt, a yellow sweater, blue pants, black socks, and blue shoes with white soles.

On summer 2017, he replaces his usual shirt and sweater with a white shirt with a yellow part on the upper body and shoulders.

Description
Hajime is initially shown to be a typical child who is kind and sweet who cares about his brother Rei and depends on him when they lose their parents. However it is later revealed that Hajime is a genius who is a smarter and more skilled programmer than even his brother as he solved the problem in minutes that it took Rei weeks to solve. This leads leviathan to kidnap him and force him to singlehandedly create bootmon. After he is rescued Hajime becomes an indispensable support for the appdrivers as they try to defeat Leviathen.

Etymologies

 * Hajime Katsura (桂 はじめ)
 * Ja: Katsura (桂). Japanese surname that means "". Possibly from Rei Kātsuwairu (レイ・カーツワイル), author of . It might also refer to the or  as a reference to the.
 * Ja: Hajime (はじめ). A Japanese masculine name. It can mean "one" (一), and with Rei is a pun on "".

Anime
During Haru Shinkai's pursuit on Rei Katsura for the 7code chips, the latter explains his motive: To apprehend Leviathan and rescue his brother (Hajime), who suddenly disappeared along with most of his biodata.

Rei initially thought that it was his solving of Leviathan's cryptic clue that led to Hajime's abduction. It was only revealed much later that Hajime was actually the first person to solve the cryptic clue (taking him almost immediately, while his elder brother took weeks). The cryptic clue was used as a means to recruit someone with great AI knowledge to create a startup tool for the Human Applification Project. After his disappearance, Hajime was then ordered by Leviathan to create. However, knowing that the Human Applification Project has grave consequences, Hajime had secretly installed an emergency escape program into Bootmon and activated it just as Leviathan was about to retrieve Bootmon. As a result of defiance, Hajime was modified by Biomon, turning the former into Sleepmon.

Appmon Forms
Due to 's modifications, Hajime has become an Appmon.

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Sleepmon
Sleepmon is Hajime's Appmon form.

On October 31, Sleepmon is sleeping at Nakamura-Fujimizaka while reports to Leviathan.


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