Board Thread:Arrow discussions/@comment-807326-20181127020807/@comment-26537965-20181130121517

Just going to copy something from his page:

Diaz thought for his entire life that he was a loser due to Jesse Federico's bullying.
 * Ironically enough, Diaz is perhaps the most formidable and successful main antagonist of Arrow thus far, as he proved too much for Oliver alone and forced him to resort to sacrificing his freedom to defeat him. Even then, Diaz was the only main antagonist in the whole Arrowverse that wasn't truly defeated at the end of the season and reassuming his role in Season 7, as stated above. However, Oliver's spectacular defeat of him has made Diaz extremely vengeful for the same reason as his vendetta towards Jesse but to a much greater degree, as while Jesse only made him a loser to the orphanage he was raised in, Diaz's spectacular defeat at the hands of Oliver has proven to the entire world, particularly the criminal underworld, that he is nothing more than a loser.