Jack is a moody, disinterested, and tired person who although would rather not deal with anyone, is not afraid to speak his mind and confront what upsets him, often in a rude and antagonistic manner. Most people that know him either have no opinion on him, or would rather avoid him due to his standoffish attitude towards anyone he meets.

Although he seems like a pretty terrible person to be around, anyone who is able to get to know him would learn that he is a passionate, caring and hardworking man who puts up a tough act to protect himself from the world due to his past. It's hard to share much more about him, as I don't want to spoil that just yet!

Any American accent should work for Jack, so feel free to experiment and give me a voice you think would fit!