Olivia also talks about Jack and Kim's relationship and them forming a special bond at the 2013 KCA's when she was interviewed. Kim: (offended) Okay, I'll try, but I don't know if a heinous troll like me would pull it off. (tries to attack Milton) Jack: (held Kim by the waist) Whoa!
Jack is extremely strong, which allows him to do several things the other members of the dojo cannot.
Jerry, Eddie, and Milton invited him to sit with them in school even before he takes out four Black Dragons, who happen to be bullies. Jack has the highest rank in the dojo, being a 2nd degree black belt. Jack often has to inspire people to do their best, and often helps the group solve their problems.
He is also a heartthrob as seen by the many girls that fall for him. He is convinced Kim has a crush on him (which she does) and he has a crush on her in return.
He was first seen in the dojo when he jumped through the wall to try to not be caught by the mall cops.
He has a fear of clowns ever since his fifth birthday.