I'm bad at describing people, so I thought I'd practice and find an adjective for every letter in the alphabet. For Jim, because he's probably easiest.
Surprisingly, the hardest part wasn't finding words that describe him, it was organizing the words so I don't have more than one per letter and finding synonyms with another initial. And I tried not to list words that are pretty much synonymous, which is hard - some things just go hand in hand.
I couldn't help myself using some words that were used in canon. I just had to!

Affable
Bored
Changeable
Dangerous
Expressive
Flirty
Graceful
Holey (;__;)
Insane
Jokey
Kingly
Lonely (aka solitary and it just occured to me how aptly named my playing-cards graphic is ;__;)
Misleading
Naughty
Obsessive
Psychopathic
Quick-witted
Rich (most likely; no pun intended btw, hehe)
Sexy
Theatrical
Unscrupulous
Villainous
Well-dressed
X
Youthful
Z