In the introductory commentary to the Penguin Classics Deluxe Edition (2005) of the Tibetan Book of the Dead, the Dalai Lama describes the Tibetan Buddhist view of what constitutes a person, as set out below.
"Among the ancient schools of thought, which accepted the notion of continuity of consciousness, there were several non-Buddhist philosophical schools which regarded the entity, the 'I' or 'self', which migrated from existence to existence as being unitary and permanent. They also suggested that this 'self' was autonomous in its relationship to the psycho-physical components that constitute a person. In other words they believed or posited that there is an essence or 'soul' of the person, which exists independently from the body and mind of the person.

Aztec ritual human sacrifice portrayed in the page 141 (folio 70r) of the Codex Magliabechiano. 16th century