No one has the smarts quite like Lucca! This nerdy, confident scientist is the best friend of Crono, and creates the device that kicks off Chrono Trigger's entire plot. While Lucca projects an air of confidence about her, she is clearly insecure about certain things. A dark past haunts her, and her inability to mingle well with other humans casts doubt on her actions. Machines mean a great deal to her. To her, robots are just as human, if not moreso, than humans themselves. 

Lucca's voice would likely have a degree of maturity to it, with a nerdy stereotype such as a nasally voice or somewhat know-it-all demeanor.