Professor Elvin Gadd

Elvin Gadd is a friendly, absentminded scientist who helps the Mario Bros. with his many inventions, including the FLUDD pack and Bowser Jr.'s magic brush (Super Mario Sunshine) and Luigi's Poltergust 3000 Ghost vacuum (Luigi's Mansion). He also has smaller roles in a lot of the Role-Playing Game titles, providing backup with even more inventions. His name in the Japanese version of the games is "Oya Ma" ("Oh my!")