This elderly scientist is the founder of Gadd Science, Incorporated. He invented both the F.L.U.D.D. and Bowser Jr.’s Magic Paintbrush, but his specialty is ghosts, even choosing to live in various haunted woods to focus on paranormal studies. He’s Luigi’s tech support in the Luigi’s Mansion series, having created a very familiar line of communicators, a teleporter called the Pixelator, and Luigi’s trademark Poltergust.