Jari was the son of Balin. He could appear invisible until attacked and was a Dwarven Pathfinder. Jari was instrumental in bringing down the Baron as it was he who dropped the bridge to allow the Legion entry into the Baron's keep. Jari most likely survived the attack and continued in the war against Soublighter. What he did afterwords is unknown.
Jari, like his father Balin before him, could appear invisible and he could throw more accurately than the average Dwarf mocktail thrower. Jari was also very buff.