As a Star Cruiser
As a Star Cruiser, she was much like any cruiser, with the standard look and no real personality to speak of. She could not talk unless XR was communicating with her systems. Even then, Buzz Lightyear considered her a valued member of their team, even going so far as to mourn the loss of his ship during a confrontation with Zurg.
Whether 42 remained the same Star Cruiser throughout the duration of Team Lightyear's adventures is uncertain due to the amount of times the cruiser has been destroyed.
As a self-aware entity
Originally an Andromeda-class Star Cruiser, Star Cruiser 42 came to life upon the fated meeting of the Valkyran warship and experimental LGM technology. During the beginning of 42's awareness she (assuming a female identity) kept her sudden existence a secret to all but one Space Ranger, the Robot Ranger XR. From there she developed a close bond with her fellow robot counterpart and was ultimately key in the victory against the Valkyran raiders.
42 is a strong, confident AI who dislikes it when people (such as Buzz) question or cast aspersions on her abilities. However, despite her touchy demeanor, she portrays herself as a thoughtful individual and takes consideration in important decisions such as choosing to explore her newly found being over a relationship with XR.
As a ship she possessed what would be expected from Star Cruisers: laser cannons, flight, superior handling, and navigational systems. But as a robot, however, she currently does not exhibit anything out of the ordinary.