enneagram
Nine types, eighteen wings
The Enneagram describes motivation rather than behaviour — why you do the thing, not which thing you do. That is what makes two people of the same type look nothing alike.
The three centres group the types by the emotion sitting underneath them, not by temperament. Body types are organised around anger and control, Heart types around shame and image, Head types around fear and security.
How to find your type
Do not start from the descriptions. Every type reads partly true, because every type is a description of an ordinary human strategy, and picking the one that sounds most flattering is how most people end up mistyped. Start from the core fear instead: there is usually exactly one that produces a flinch.
The second check is behaviour under pressure. Types are most distinguishable at their worst, not their best, because the strategy is running hardest there. If two types both fit, look at what happens on a bad week rather than a good one.
The third is that the Enneagram describes motivation, not behaviour. Two people of the same type can look nothing alike, and two people who behave identically can be different numbers doing it for different reasons. That is the whole point of the system and the thing that makes it hard to self-assess from a list of traits.