Omniscient

Omniscient:

Omniscient describes headmates that have access to the memories of every member of their system. Typically, they can see the entire headspace at once.

Omniscient headmates may frequently feel blurred with other members of their system due to their memory sharing.

Related Terms
Omniscient headmates may also be gatekeepers, as their knowledge of all that is going on is useful.

Omniscius may be considered a synonym or overlap.