13-Amp is a female teenager famous for her rapping skills, she once stole a kid's video games, but WarioWare Inc. employee 18-Volt gives them back after beating 13-Amp in a rap battle, since then, 13-Amp and 18-Volt became rivals and often do rap battles against each other. 13-Amp usually wanders around the streets of Diamond City to rap some verses and to challenge others. She works at WarioWare Inc. Where she develops microgames for Wario alongside 18-Volt, 9-Volt and the rest of the crew