The only way to properly investigate this is to have multiple bodies and a functioning method to transfer your consciousness from body to body.
Start with these assumptions:
- Consciousness can be separated from the brain (ghost, spirit, soul, etc.).
- Consciousness can be detected and tracked (electromagnetism, maybe. You need to verify "who" has control of which body at any given time).
- Consciousness "claims" a body when it first enters that body, rendering the body useless to all other consciousness (as in, no body snatching; abandoned bodies remain comatose).
- That it is (somehow) possible to grow, build or construct a body such that no consciousness has been able to "claim" it (some sort of a consciousness repelling material or field so as to control access).
- That memories can be transferred from brain to brain with the same (or similar) mechanism which allows consciousness to be transferred from your starting body to an "unclaimed" "constructed" body.
- That "disembodied spirits" are able to communicate with each other (what better way to get to "know" someone than to communicate without any type of body creating distractions, etc.).
It is easy to make these assumptions; the key (and most difficult) is this one:
- "That each of these assumptions can be engineered and proved true."
Once you have done the Very Difficult work of proving true the various ideas presently assumed false, you may then have the chance to view the universe from the perspective of however many bodies you are able to "construct" and maintain. At this point, you and the person you want to get to know will be able to figure out the answer to your question by exploring the possibilities together.
I intend to see at least some of that technology developed; it would help if you (and others) worked on it too.
If you like anime, you may consider watching "Kaiba"
It is quite cartoony (unlike most anime), none-the-less, it investigates many of the aspects of your question and it illustrates some of my assumptions too.