Depends on the kind of trauma and the individual?
Not everyone grows from trauma. Some people go through arrested development and stay stuck there for quite some time.
The ability to overcome adversity and become a fully wholesome person depends on the person's environment too. Having a parental figure who instils love, compassion, and believes in their child can really help to build resilience, a strong personality.
Just imagine, on the other hand, a child who suffers through trauma and growing up in a system without any sort of emotional support. They could cave in and become null and numb to life. An overly traumatized individual who suffers through an unlucky bout and string of trauma can also revert to lacking a strong personality, strong sense of self due to their lost abilities to express themselves in a very limited circumstance (years of imprisonment, whether real or emotional).
Really depends. I think overall, enduring life experiences that are out of the ordinary can in some ways help build
character. Because, those who have suffered and persevered, can empathize with others on a whole other level. And, sometimes, being able to survive, takes courage, a type of understanding unique to that very individual, which makes them different from their generic 4 generated letters, which don't say a thing about life experiences!