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Early on he was an introverted nerd. He experienced a lot of trauma growing it up. The death of his mother lead him to become an outcast but at the same time it gave him a great sense of justice. Like most introverts he was a nerd which combined with his great sense of justice led him to pursue a career as a police scientist.
Later on in life as he matured he became very noble. His sense of justice and morality turned him into a more stoic individual leading through example and becoming a great mentor to Wally West. His time with Wally helped him become an amazing and righteous person. A symbol of kindness.
With Barry's powers he had the means and the want to help anyone he came across. This meant not only would he sacrifice himself to save the universe but help a random guy he never met with his car troubles and treat every case he worked on as important.
Barry's greatest achievement was the legacy he passed on to the people who cared about him. He would have an amazing effect on Wally West who would spend over a decade trying to become more like Barry. He instilled a moral guide and a person to look up to in times of doubt.
Barry Allen was the greatest Super Hero who ever lived and is the perfect example of what the medium stands for.