Don't ask me why I ask this question, I just did. I see similarity in these two characters. Each was a tough girl who when they were protagonists (so when it comes to 18, I am referring to the Buu saga) who were background characters. They were not as promoenent as Bulma or Chi Chi, anyway who like better? Launch or Android 18? When I refer to Launch I mean just the blond crazy "evil" Launch not the blue haired"good" Launch. I am disappointed that Launch was written out and forgetten when they got to the Sayans part. She could have been like Yamchra, Oolong, and that bunch and just get demoted in importance but still be there, just so the two of them could cross paths. As to answer my own question, probably Launch, with the split personality there was a lot to her character, once 18 turned good, she was just Krillen's no nonsence wife, though I loved in one of the movies when she trashed Mister Satan's house. I am thinking a fun AU fan fic would be those being a duo like Thelma and Louise.