Jack is very very obnoxious, loud, chaotic, and a gremlin. He is either glaring, teasing, or throwing a tantrum and no in between. He often makes fun of Marion and his lack of brain cells but enjoys when Marion doesn't kiss ass to the higher ups (aka himself.) Despite his ability to carry himself at times, he is also very childish, and would throw a tantrum the moment something goes against his ideals.

I imagined his voice to be in the mid-high range, and you have to be willing to yell a lot. Out of all the lines given, to be cast, the laugh has to be really good. Go all out on the laugh.