Oh man, I answered this before. HERE WE GOOOOOOOOOOO

The Chariot arcana is commonly associated with aggression and one's focus towards their own goals. Chariot's backstory of aimless wandering and a general sense of powerlessness when he left Kazimierz matches the interpretation of the reversed arcana. His current self as a Vanguard Operator (specifically, a Charger, an inherently proactive and aggressive subclass) and his taking charge of rescuing civilians and leading other Operators in Starfrost's Night represent an interpretation of the upright arcana.