Oichi aka 1.0-tan

From OS-tans.moe Wiki
General Information
Full NameOichi-san
Universe/OriginFutaba Channel
PersonifiesWindows 1.0x
First available1985-11-20
Hair ColorBrown
Eye ColorBrown

Oichi (Japanese: お壱さん, Oichi-san) is a Futaba Channel OS-tan that depicts Windows 1.0x.


She is depicted as the matriarch of the Windows-tans, and the sister and friend of Ōbaba (the 3.1 OS-tan). Her hobbies are origami and Reversi. These hobbies are derived from the inability to stack windows on top of each other in Windows 1.0, so the windows were arranged like origami papers, and Reversi was commonly featured in screenshots of Windows 1.0.

She normally wears a kimono, but Ōbaba has sometimes forced her to wear strange outfits. Her favorite food is tsubuan (red bean paste) yokan.

Being born in the Showa period, as per Windows 1.0's release date, she has a retro, old-fashioned mindset and is profoundly nostalgic. She is usually confused by the gap between past and present.

When she is angered, she can produce laser beams from her eyes.


  • Outside Japan, she may be known as 1.0-tan by analogy to 95-tan, Me-tan, 2K-tan, and XP-tan, though the 1.0たん name is not used in original Japanese works.

See Also

  • Windows 1.0x, page about the OS itself that also lists alternate personifications.


  • Her entry on the 2jiwiki @Wiki (508)