Charles Tucker III (mirror)

Commander Charles Tucker III was a Terran who served aboard the ISS Enterprise as chief engineer. His constant exposure to delta radiation from the warp core had severely deformed him. 

Before In a Mirror, Darkly
On January 23 2153, Tucker entertained a pair of visiting Vissians], [[Traistana (mirror)|Traistana and Veylo, in the mess hall. After moving away when Malcolm Reed joined them, Tucker joined the Vissian chief engineer, his wife, a microgravity engineer named Calla, and their cogenitor. Interested in the idea of a third gender, Tucker consulted Doctor Phlox for advice before boarding the Vissian vessel. He was disturbed to find that the cogenitors were uneducated, nameless, and were treated as commodities to be passed around. Tucker encountered little support amongst the crew, with Commander T'Pol finding the Terran's concerns over slavery to be hypocritical. Nonetheless, Phlox agreed to give Tucker the means to measure the cogenitor's brain activity.

When Tucker discovered that cogenitors were as mentally fit as the males and females, he chose to secretly educate the cogenitor. Tucker showed the cogenitor The Handmaid's Tale first before moving on to Vissian literature. The cogenitor also decided to adopt the name 'Charles' for itself. Becoming more daring, Tucker sneaked the cogenitor aboard Enterprise, showing it the transporter and engineering, but his activities led to him being banned from the Vissian ship. Captain Forrest ordered Tucker to be punished by Phlox and Corporal Elizabeth Cutler. First Officer Archer was more sympathetic.

After the cogenitor suddenly declared allegiance to the Terran Empire, diplomatic relations between Enterprise and the Vissians broke down as Forrest now had no choice but to give the new Imperial citizen asylum. As Enterprise rushed to join its assault fleet, Tucker did his best to increase the acceleration. When Starfleet finally captured the Vissian ship, Tucker gloated that this served them right as they refused to allow the cogenitor to read, which Archer and Reed agreed with. The cogenitor was transferred to a starbase.