Pinky and the Brain was inspired by two producers of Tiny Toon Adventures, Tom Minton (L) and Eddie Fitzgerald ®.
From the original BuzzFeed article
Tom Minton is an American animator, producer, writer, and storyboard artist. He created and wrote the “Toby Danger” episode of Freakazoid!, wrote the lyrics to the song “Brainstem” and served as head model for the Warner Bros. character the Brain in Pinky and the Brain. He was story editor of Ralph Bakshi’s Mighty Mouse: The New Adventures, a 1987 series art-directed by John Kricfalusi.
Eddie Fitzgerald is a writer for Tiny Toon Adventures. He served as the inspiration of Pinky for Pinky and the Brain; however, unlike Tom Minton (who was the inspiration of The Brain), Fitzgerald had no involvement with the series otherwise
From the original BuzzFeed article
https://en.wikipedia.org/wiki/Tom_Minton
https://tinytoons.fandom.com/wiki/Eddie_Fitzgerald