ZERO

0 was made before INFINITY and fights the fellow OS in the ZERO to INFINITY storyline. She is originally found in ZERO's HQ in the Control Room. In the timeline, 0 was destroyed multiple times, but was kept alive by Z3RO who continued resetting 0 by restoring the timeline back to Season 9, the golden age of the organization ZERO. During Season 9, the government was made up of mostly ZERO members, giving 0 access to Water transportation, Electricity, Sewage, Trash disposal and other systems. 0 needs variables to be kept stable and to gather intel on the outside world. She collapsed during Season X, but is still alive because Z3RO keeps switching her over to looped timelines. No one remembers or knows who built 0 because they either didn't come from her original timeline or their minds were erased when the maker was assasinated.