LISP was the fourth in the line. Three sample units (Alpha, Beta, Gamma) before it were trying to do the job they were programmed to: to make their owners rich by not using proprietary chassises like Cybot Galactica. They wanted their own. They tried chassises more specialised...but they cost a lot of money to develop.
Mk4 was different. An ancient B1 chassis refurbished. The fulfillment of its life would be constructing droids and security equipment. And boy was it good at that. The owners of the design were happy, as it was bringing in the desired results. The slight issue with its communication unit? Well, it might as well be the MK4's sex appeal.
When Ras Q'uandel died on Belsavis and the news reached his family, of course, they were devastated, and realized that they would need to help their daughter. Hence, they spent a considerable amount of money to send LISP over to Mylla. The only request was that they don't need only about 50% of all the money the droid makes. The rest it can keep, to collect money to buy its freedom.
Progress. LISP wants to make better products.
Servitude: 20. LISP is owned by the Q'uandel family.
LISP4 looks like a classic B1 droid, only its forearms are considerably thicker as those parts hide most of the tools the droid uses for its work.
It also has a lisp.