Oh hell no. No no no. Fuck putting characters in anything where they are only a love interest or brief plot device (2012 April, anyone?).
No, I want Mona Lisa because she was an intelligent, witty female in a male-dominated profession and universe. Unlike 80s April, she did not need (or want) men to empower her, give her permission, or rescue her. She was the one who did the rescuing. She was the strong, clever one. She was the hero of the episode.
I want Mona Lisa. Lots of Mona Lisas. Everywhere. Every fandom. :)
I wanted to reblog this again for the above comment because it details the real reason I want Mona back.