Answer:
I'm not sure what you mean by "simple system" but coming from a system, here's a few of them:
- Protectors
- Caretakers
- Memory and/or trauma holders
- Littles and/or child alters
- Fictives (fictional introjects)
- Factives (non-fictional introjects)
- Gatekeepers
If you have any other questions, I'm totally open for questions. Every system is different, though, so answers most answers will be based on my own experience :)