J4 Began their existence under the craftful hand and mind of an older Jedi Guardian by the name Wi-Nel LeSan, whose differing opinions from the order kept him often on his own but still loyal to the Order. In his age, he required a companion to handle the new war thrust upon him. He hacked up, then hacked into a prototype SuperBattleDroid: ctd. Description. . .

Wi-Nel carried out subterfuge, infiltration, sabotage, and other team of two missions with J4 into the darkest days, weeks, and months of the Clone Wars. Every day J4 became more knowledgable and more capable being taught the ways of the Jedi, from lightsaber combat all the way to how a Jedi needs to be trained in the force, and secretly the differing opinions he held.
Leaving a moon used for mining high density ores for separatist ships after what seemed to be a successful sabotage, when the facility didn't melt down they looped back in, but the droids were alert and fired from the ground, J4 took evasive acton and scrambled to space. Greeted by a separatist ship outside the atmosphere, J4 prepared calculations for the jump as they meet fire from the ship. Calculations in just before the jump a direct hit cracks the glass of the cockpit, under the pressure of the sudden jump to hyperspace already underway began to give way, J4 pulls the throttle back just as it gives way and they are sucked into the vacuum of space forcibly. J4 tries to bring him into the ship to heal but there was no way to repressurise the cabin in time. J4 repairs the ship in space and returns his body to Courosaunt, where the Jedi are impressed with J4 and the asset they would be to a team.

On death of his creator and master his primary objective is to continue to learn and serve the Jedi Order, but a secondary objective is also programed into their subconscious but it is encoded to not be understood completely at this time by J4, only that they are looking for a wise and special Jedi.

Dutybound- 25

Excess material was trimmed reforged and repurposed to add armor or strength in the frame, pieces that formed the wrist blaster were reworked to house a more powerful and upgradable blaster. Hands were completely redesigned to more replicate the delicacy of a human hand at normal position with tools available to actuated from the hand. Excess Frame from the wide shoulders protruding the original battle droid were reformed to form storage with internal fastening In the back and around the midsection of the android. The reprograming of the droid was most intense he spliced together two droid systems the original combat oriented SBD and his personal protocol droid. The protocol droid's intense capacity for learning and AI personality and near limitless memory would now have direct input over the prototype's over designed movement, sight, awareness, and advanced sensory instrumentation. J4 is able to learn a multitude of combat roles utilizing weapons as simple as the ones built into them as all the way to heavy ship weapons and even many different styles of lightsaber combat.