R4-5T "Rusty" could be said to have seen better days. Looking more like the result of a scavenging run than a fully functioning C1-series Astromech Droid, its plating is missing in several key locations which leaves its internal circuitry exposed. Wiring flows out of the main chassis before snaking its way back under the next panel along its path. Servos and non-critical systems are laid bare for all to see, but R4-5T "Rusty" retains its functionality despite this.

R4-5T "Rusty" has had its sensor suites upgraded to significantly increase their range and sensitivity, allowing this C1-series Astromech Droid to collect and record a wide range of data during scouting operations. These sensors are far more sensitive to jamming interferance and are more prone to damage.

R4-5T "Rusty" has developed a personality around the concept of a caretaker. It has assumed the needs of Liam Torun-Urr to be its prime directive, even such tasks that have not been requested of it. This results in R4-5T "Rusty" often flitting about in an attempt to meet any possible task before it is necessary, including menial tasks.