A male Deep Gnome Spy, Jimjar is a feckless rogue with a devil-may-care attitude, a fondness for coin, and an obsession with betting on virtually anything and everything. Once he knows the characters, Jimjar regularly offers them bets on things from their own efforts ("I bet you ten gold you can't get past that sentry without being seen") to the outcomes of random events ("I bet you twenty gold this tunnel is the right way"). He sometimes uses betting to goad others into doing things, but characters can easily turn the tables knowing that Jimjar finds it difficult to refuse a wager. His behavior is unusual for the dour Deep Gnomes, and others of his kind (including Topsy and Turvy) find Jimjar annoying at best, and unstable and potentially mad at worst.
Jimjar is always true to his word, and he manages to keep exact track of his debits and credits in his head, paying up on his bets (or demanding payment) as soon as possible. He's not above pocketing a little extra coin when no one is watching, and he has an amazing ability to secret significant wealth on his person.
Jimjar feels as though there's something odd about the twins Topsy and Turvy, but he keeps his opinion to himself unless asked. He does his best to get along with everyone, although some find his gregariousness and constant wagers grating.