5-Volt

"9-Volt!! It's past your bedtime!"

- 5-Volt

5-Volt is 9-Volt's mother and makes a few appearances in the WarioWare series. She is never fully seen until Game & Wario. 5-Volt lives along with 9-Volt and presumably his pet Fronk in a house in Diamond City.

5-Volt debuts in WarioWare: Twisted!, where she shouts at 9-Volt to go to bed since he is playing with 18-Volt all day. 5-Volt is seen only from behind and from the knees down. After 9-Volt has gone to bed, he still furtively plays with his Game Boy Advance SP under the bedspread, but she catches him when she opens his room's door a second time. 5-Volt's silhouette is seen in the doorway.

5-Volt is seen in WarioWare: Touched! as a silhouette in the Game Over screen of 9-Volt and 18-Volt's stage. She watches her son and his friend eating.

5-Volt is seen again in Game & Wario, during the Gamer stage. This is the first game to show her face completely. She often drops by 9-Volt's room to check if he is sleeping, and the player must pause 9-Volt's console while she looks at him. She also can attempt fake-outs, as well as be seen on screen twice at the same time.

Trivia
According to 9-Volt's diary at the official Japanese website for WarioWare, Inc.: Mega Microgame$!, 5-Volt's birthday is on March 13.