EXEC
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EXEC is one of the earliest OSes , designed for the UNIVAC hardware (the first being the UNIVAC 1107).
EXEC-tan is the oldest living OS-tan; represented as a purple-haired woman in a beige, Renaissance-era dress with white trim, red undersleeves, black underskirt and her outfit is in the color scheme of the UNIVAC machines. She has a lot of ruby jewelry which imitates the round, red lights and dials. Her hair is 10 meters long and partly braided in a ponytail and its extreme length is symbolic the high complexity of the UNIVAC machines.
Her hair cannot be cut because it is an extension of her brain and getting it cut would be painful and damaging to her intelligence, reflexes and other functions. Cutting it short or shaving it off would kill her. And since her company has been long-gone, taken with them the only means to perform any kind of corrective surgery to fix her hair, she has to stay like that forever.
She is much too slow and old to handle basic tasks but is very kind, calm, wise and able to provide the voice of reason for the Vintage-tans she lives with. She was melancholy and felt like a useless burden because of her severe limitations but has cheered up since befriending GENIAC-tan, who grew up in the same time period as her (able to relate to her experiences) and bound by strings and limitations of her own.
She gladly volunteered to be GENIAC-tan's caretaker, simply needing to hold her handle and keep her company. And because of EXEC-tan's patience and motherly demeanor, she is also able to easily calm down GENIAC-tan and help her overcome her phobias. In return, EXEC-tan has cheered up, feeling useful and having a friend she can relate to.