Thonis was a fictional Andorian male member of Starfleet Security used in security and tactical problems at Starfleet Academy, such as in the Advanced Security Techniques course. His biography listed him as a graduate of the Vulcan Academy of Sciences. He was a top student in every class, including graduate-level classes in computer technology taught by Sarek of Vulcan. These gave him excellent computer infiltration skills. He had a tricorder in his inventory.