In this redesign I for the most part kept the main design the same. The most notable changes are his eyes are more rounded with an added border around them. Plus his chest is a lighter blue, and sneakers.

Jack's character Bio:

He is very shy to the point of being antisocial.
Not a big fan of people in general.
Very loyal to his friends. They're the only people he will go above and beyond for.
Not as willing to help people, and not as likely to go an adventure.
He would prefer to stay at home and watch movies and play games
He doesn't really have any powers