One of the tarot cards that immediately springs to mind when considering which ones best describe an Aries's personality is The Emperor.
The Emperor card is the one that dominates this fiery sign's characteristics out of all the Major Arcana cards in a tarot deck.
The Emperor has a compelling personality. It is characterized by a craving for authority and a yearning for independence.
The Emperor, one of the deck's kings, is exceedingly obstinate, and Aries is typically characterized in the same way.
When in a position of authority, both The Emperor and Aries perform at their best.
The Emperor's negative side is that, if off balance, the approving authority figure might easily mutate into a hostile tyranny.