The depth-psychology corpus treats ‘subpersonality’ as a concept that straddles clinical psychopathology and ordinary psychological life, positioning it as the rule rather than the exception in human experience. Howard Sasportas, in his seminars collected with Liz Greene, provides the most sustained and operationally developed treatment, mapping subpersonalities onto astrological placements and demonstrating how planetary tensions produce internally conflicting psychic figures — the ‘Super-Server,’ the ‘saboteur,’ the ‘wolfman’ — each possessing its own mythology, somatic signature, and developmental history. Murray Stein grounds the concept in Jungian theory, citing Jung’s own recognition that ‘traces of character splitting’ are universal and that ‘character is situational.’ The Internal Family Systems framework of Richard Schwartz offers a parallel clinical vocabulary — managers, exiles, firefighters — that systematises what Sasportas treats more phenomenologically. Erik Goodwyn extends the dissociative model to argue that multiple sub-personalities are a normal property of the psyche, not a pathological aberration. The central tension running through the corpus is between integration and plurality: whether subpersonalities are to be synthesised under a governing self, or whether their multiplicity is itself a permanent, necessary feature of psychic life. The practical question of naming, dialoguing with, and ultimately transforming these figures recurs as a therapeutic imperative across every major voice.