Actually, the four suits of playing cards are associated with personality traits, already. (They're the same as the Tarot, which was based upon the standard playing/trump deck, although the names and symbols changed.)
Spades (swords) - Logic and reason. It represents a cool/cold personality. (So, kuudere.) Hearts (cups) - Emotion and passion. Means hotblooded or warm and kind personalities. (So, deredere, or maybe tsundere.) Diamonds (pentacles) - Practicality and literalism. For down-to-earth personalities. (Imoutos and fashionistas.) Clubs (staves) - Dreaming and abstraction. For artists and intellectuals. (Quirky girls.)
In fact, Karl Jung, researching these ancient symbols, laid the groundwork for what would become the Myers-Briggs Personality Types. (Which added Intro/extroversion and Judging/Sensing as additional distinctions.)
