9-Volt is an energetic super duper hardcore Nintendo Fanboy. You can tell just by seeing his room... Almost everything there is Nintendo-Themed! He even has a Nintendo-Themed D.J Booth! 9-Volt also loves to play Nintendo-Branded games so much, that he'll even sneak in a few cartridges for his handhelds during bedtime while his Mom's not looking! Make that a pretty sneaky and cheeky die-hard Nintendo Fanboy! As well as being an avid Nintendo-Branded collector, 9-Volt also is a microgame designer in WarioWare Inc.! That's right, this young chap's still in elementary school, and has a job in Wario's big company at the same time! 9-Volt just goes to show that you're never too young to get employed to make microgames for a company like WarioWare Inc.! Even if it's run by a greedy, gold-adoring crook!  

(For 9-Volt's voice, I will allow his to either sound similar or identical to his current high-pitched child voice provided by Melissa Hutchison, or his voice in the older games provided by Reiko Ninomiya, provided by the same or a similar sounding digitalized voice effect. I'm actually looking for a female to voice this young male Nintendo Fanboy child because of that. Here's some voice clips for reference!)

Melissa Hutchison: https://youtu.be/cnHFXT2FWhQ

Reiko Ninomiya: https://youtu.be/d6bT2p6veKQ?t=37  https://youtu.be/vOCDHtkjCX0