What are you're O5 Council Interpretations?

This is my response

I think that most of the members of the O5-13 Council possess a longevity that is largely superhuman, along with capacities or anomalous objects (psychic powers, superhuman intelligence, immortality, etc...) and are surrounded by at least a few subordinates who themselves possess anomalous powers/traits.

I think that the members of the O5 Council were originally non-anomalous humans, but became anomalous after being recruited by the Foundation, either through other O5 members or by the Administrator. Except perhaps for O5-13 who is probably the most ordinary of them all and is there to remind the others what "normal" means.

I also think that O5-1 and the Administrator are two different people and that both of them greatly contributed to creating the Foundation.

O5-1 and the Administrator are the ones with the greatest power, but the Administrator is often the last resort. He intervenes only if things go horribly wrong or if an O5 strays from their mission.

The Administrator can be contacted at any time by the O5 members to receive crucial information.

I do not subscribe to the idea that O5 members die easily.
Most members of the Council have countermeasures against natural death and conventional weapons. From this point of view, the most reliable way to kill an O5 permanently is through anomalous means.