Jess is one of the five characters introduced in a side plot during the end stages of Act 4-4 "Another Home".
Like many of the characters not much information has been given.
Jess appears to be a teenage boy.
This is all the information given
During the final stages of the side plot Jess appeared to use a lighter and his breath to create a huge burst of flame.
One of the final things said in the plot was "So how's it feel to be BULLET PROOF, Jesster?" this was said after Jess was injected with a strange formula which seemed to be the focus of the side plot.
- Jess is one of Soras' underlings.