Jones was originally an adventurous man who could easily adapt himself into all kinds of unknown places. He learned to speak 342,000 languages from all the realities he explored. He would try his best to fit in and befriend everyone he comes across. Jones comes from an "Unstable World" reality where he needs to fight to live.

After becoming an IO agent and gaining ageless immortality, he thought he had all the time to fix any mistake. But after his wife and children died of old age, he began to see his immortality as a curse and to be consumed from within by doubt and sadness, which he hides behind a mask of an unserious and joking person, except when the situation was really serious. However, despite everything, Jones maintained a heroic phase for a time and managed to remain himself, but the disappearance of The Seven along with the destruction of Reality Zero followed by Peely's kidnapping drastically changed him overtime, creating a much more stern, serious, and colder self-image and adopting a philosophy of vengeance. He also became arrogant after The Society's and The Pantheron's defeats although it didn't last long.Over time spent with Hope, Jones began to develop a protective father figure personality towards her.

With Jonsey being an existing character an impression is required to do the role. 

A link to all his voice lines can be found here.