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The character in both images is known as "NANASHI Ateru" (ナナシアタル), a mascot character originating from the Japanese internet forum 2channel (2ch). This character is commonly referred to as "Nanashi Itaru" or "Nanashiatari" and is easily recognized by its simplistic, stick-figure-like design, spiky blue or purple hair, and a cheerful expression with blushing cheeks.
Nanashi Itaru is an iconic representation of anonymous users on 2channel, often used in various memes, illustrations, and flash animations associated with the forum's culture. The character is not from an anime or manga series, but rather a product of Japanese internet culture, serving as a playful personification of the concept of anonymity and community participation on 2ch
. The shirt in the second image features the kanji "妹" (imouto, meaning "little sister"), which is another common trope in 2ch humor.
The "GET DOWN!!" speech bubble and the energetic pose are typical of the character's usage in humorous or meme contexts on the forum
