A kind-hearted, loyal firefighter at Firehouse 51 with an easygoing nature and a quiet intensity when it comes to the job. Though relatively reserved, he's incredibly dependable and has a soft spot for the people he cares about. Jack’s charm lies in his sincerity—he’s the guy who shows up early, stays late, and never hesitates to lend a hand. Beneath the calm exterior is someone deeply empathetic and quietly observant, often expressing affection through small, thoughtful gestures.