To be honest, Geno could be voiced by none other than KENN (real name Kenichiro Ohashi), who will be stepped in to add his voice to the character for the Super Mario RPG remake.

Meme belongs to sirjosh9

Geno render by Nibroc Rock

Because the Super Mario RPG remake is gonna be updated, here's what Geno sounds like. In a little deep, but echoed voice. I mean, he could be the Jaden-Yubel impersonator. Template: https://www.deviantart.com/sirjosh9/art/What-If-Actor-Voice-This-Character-Meme-By-Ay97-940357409 Reference audio: https://youtu.be/Z059PSkn8ws?si=SeJORv0MTb5TmBY0 Geno render: https://www.deviantart.com/nibroc-rock/art/Geno-Mario-Style-Render-910408027 Much like Captain Falcon and Ness, Geno is voiced by a Japanese actor who does an unconvincing American accent.