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Borujoa
Borujoa (ぼるじょあ), a typo of 'bourgeois',1) is a short-lived AA character who derives its name from a tripcode user who was active in July–August 2002,2) before voluntarily leaking it,3) then users started imitating him before someone used the tripcode to spam multiple boards.
History
On July 30, 2002, a tripcode user named “Bourgeois Youth” (ブルジョワな若者, Borujowa na Wakamono) had appeared on 2channel's /pcqa/ board.4) He couldn't type 'bourgeois' correctly, so he eventually settled on the name, “Borujoa” (ぼるじょあ). The tripcode, ◆EncckFOU (#ぶるじょあ), would spell it as 'burujoa', and barely lasted a month before he voluntarily leaked it himself by August 30, 2002.5)
This led to a brief surge of 'Borujoa' impersonators, spamming “Borujoa's Question Box” (ぼるじょあの質問箱, Borujoa no Shitsumon-bako) across multiple 2channel boards, and users would answer questions, using his public tripcode, while doing their best impression. At some point, this phenomenon got out of hand and it didn't help with the ongoing attacks, so it died down.
Summary
Borujoa has the first-person pronoun of 'boku' (ボク), 'boru' (ぼる), 'borujoa' (ぼるじょあ), and 'joa' (じょあ). His typing quirks includes turning: 'are?' (あれ？) → 'arē' (アルェー), 'ē?' (えー?) → 'eē' (エェー), and 'uwā!' (うわー!) → 'ouwā' (オゥワー). Lastly, he would end his sentences with '-daYO' (○○だYO), '-daC' (○○だC), or '-daNE' (○○だNE), with the term 'YO' apparently signaling some level of his expertise.
Text artwork
∧＿∧ （ ・３・） （ ） ｜ ｜ | （_＿）＿）
（・３・） （ ・３・） （・ε・）← Sometimes called an impostor.
Nurupo
（ ＾＾）＜ぬるぽ ｱﾙｪｰ ∧＿∧ （ ・３・） ｜｜ ｶﾞｯ と ） ｜｜ Ｙ /ノ 人 / ） < > ∧ ＿/し' ／／ ∨； ＾＾ ） （＿フ彡 ﾉつ つ と＿)__)