I tend to think, if you're not talking about physical injuries, that emotional injuries are likely to relate to anything that damages trust in others and therefore existing, past and future connections/relatedness.
The reason I say that is that it's likely to harm internally, your self-concept etc., and externally, your relationships with others, then there's a terrible chicken and egg reciprocity takes hold and one harms the other and then vice versa into a spiral.
How rapidly that takes hold after the "first strike" harm, is liable to have a lot to do with predisposition, some people are more vulnerable to injury than others, personally I dont think its a trait, or in essence, maybe it is character but it depends how that is defined, its got more to do with context, repeated context and the recent and repeated rather than anything else.
Attachment style and such does not have to be destiny.