Meant to be sort of a follow-up to my last Rex related photo set post, since while the kid can be scary in a fight, it’s important to remember how much contact with others matters to him.
As the series progresses, he develops in such a way that he’s big on granting second chances, believing in the importance of free will and choice, and keeping his promises when it counts the absolute most, even if that promise is to a former foe. He also starts to let go of the idea of “playing it cool” in holding back on letting others know that he cares, going from telling Six to “get off the sap train” in season one to embracing his team mate/mentor/friend/father figure in season three. Rex seems to value his memories and personal experiences over material possessions, but more than anything else - even his own life and identity - he values his family, friends and allies. Nothing matters more to Rex than other people.