Hi Martin,
This is interesting; your approach to breaking down the 'nature' of traits here seems to be based greatly on semantics/linguistics.
For example, you talk about someone being 'headstrong' and say that this is a trait of fire within earth. But what about 'hotheaded'? Is that fire simply because of the implication of heat?
The Spanish translation of 'hotheaded' would be 'exaltado' which has no connection with heat; would a Spaniard then find it as easy to classify this trait? The Spanish word for 'mulish' would be 'trozudo' but there is no connection with a mule, it simply means stubborn... so languages which may not have as many synonyms might also have shorter soul mirror lists ;-)
Amberlyn