This article is a Stub.
A resident of a system that is inspired by, identified with, pulled into or pushed into the system from an externalized source. The term is sourced from psychology, not from the community.
Introjects are, in itself, neither good nor bad. A multiple system is generally quite malleable and adaptable, and "borrowing" traits, features, or even entire identities from external sources is not an uncommon phenomenon amongst multiples. If someone else seems to have an easier time dealing or coping, protecting themself, nurturing themself or others, or throwing their power around better than the system is (as a few examples), the system may unconsciously adapt or adopt traits or profiles that appear more successful in terms of system survival.
For a similar spiritual concept see Walk-Ins.