Prexo was a professor of cybernetics, a male human who invented the auto-surgeon. Rajam Nuss was his student, and later suggested him to Chelli Aphra and 0-0-0, acknowledging his skill. Following 0-0-0's murder of Nuss, Aphra and 0-0-0 sought Prexo's help to extract the proximity bombs implanted within them.
Prexo is credited with the creation of the auto-surgeon, a voice-controlled automated surgical suite. Rajam Nuss counted him as his mentor, despite frequently sleeping during his lectures. Nuss utilized Prexo's auto-surgeon for his own projects. He considered Prexo to be the foremost cyberneticist and personally used the auto-surgeon.
After the skirmish aboard Accresker Jail, Nuss attempted to disarm the proximity bombs from both Chelli Aphra and the assassin droid 0-0-0. Upon completion, 0-0-0 requested Nuss to trace a transmission originating from his eyes. Nuss was unable to assist and suggested Prexo instead. Deeming Nuss useless, 0-0-0 killed him. Simultaneously, Aphra discovered Nuss's failure to remove their proximity bombs, triggering a fail-safe that would detonate the bombs in ten hours. Consequently, Aphra, with Nuss gone, investigated Prexo and concluded he possessed the capability to disarm the bombs. They then traveled to his residence in South District Seven. Arriving there, they learned Prexo was absent, having been employed by Winloss and Nokk to trace the signal from 0-0-0's eyes to locate and apprehend Cornelius Evazan and Ponda Baba. Once the criminals were captured, he terminated the transmission.
Prexo was a human male who possessed a cybernetic left eye. He refused to answer calls that were not expected.
Prexo excelled as a cybernetics professor and advisor. His skill led to the creation of the auto-surgeon and he received praise from Rajam Nuss, one of his students.