O5-1

O5-1, the inaugural member of the O5 Council, stands as the cornerstone of authority within the SCP Foundation. Cloaked in mystery, their true identity and appearance remain unknown to all but fellow council members and select individuals. Speculation ranges from O5-1 being a collective embodiment of the council's wisdom to existing solely as an abstract concept. Regardless, O5-1's veiled presence perpetuates an aura of intrigue, serving as the Foundation's unwavering beacon of guidance in the shadows.
Among outsiders, a prevailing belief persists that O5-1 holds the pinnacle of power within the council, a notion steeped in speculation and conjecture. However, this perception is not without controversy, as debates rage regarding the accuracy of such claims. The dissemination of misinformation surrounding the identities and roles of the Councilors further complicates the matter, casting doubt on any definitive assessment of individual authority within the enigmatic ranks of the O5 Council.
The SCP Foundation official creator is 05-1 and he stands out from the rest of the 05 Council, SCP-001 "Ouroboros Cycle" states that a Chaos Insurgent under the name of Calvin Lucien killed 05-13 which broke the 05 Council's deal with Death which left the 05 Council vulnerable, and Calvin Lucien began his hunt to kill all the 05 Council members, which he succeeded to do. Once Calvin Lucien successfully terminated all 05 Council members including 05-1 he made his way to the one tablet which had the ability to terminate all Foundation sites. But before he could do so the Administrator called him and eventually persuaded him to stop, as if he were to terminate all Foundation sites the Earth would end possibly taking the universe down with it. And eventually Calvin Lucien became 05-1 himself, Calvin Lucien may have been the hunter before, but now he is the hunted...
Possible enigmatic identities:
The Dead Men
Eve
Dr. Charles Gears
Calvin Lucien
The Man With The Infinity Gun
Aaron Siegel
The Visionary
F. Williams
Luthor Chameleon
Kolt Moor