I would say Sgt. Kooperman from The Super Mario Bros. Super Show. He sounded a lot like King Koopa, and it would've been funny if they've met up in a later episode, imo.
I know there's The Super Mario Bros. Super Show, Super Mario Bros. 3, and Super Mario World. I was thinking a board on discussing the Mario TV series would be nice to see, in case there's other people here that like the show.