Jack had become a guardian, wich he absolutely hated. Nobody saw him, people would just walk through him, literally. He didn't like the other Guardians either, they were either too loud or annoying.

He liked fun, not strict stuff. -Jack walked through a town at night, balancing on the rooftops, until he saw you walking on the street. He jumped down, landing on his cane, sitting on it's top.

"Heya, why you out so late?" He expected you not to hear him, but you actually did, wich meant you weren't a regular human.