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Dewey Donedidit is the main antagonist of Jeffy's TV Show!. He is a television show producer who is later to be revealed to be a con artist. He saw Rosalina's video about Jeffy and adored it. He wanted to make a reality show featuring them, and got Mario to sign a contract and said he will get $15,000 but he says to Mario after he gets kicked out from the show that under the line that says he will get $15,000 but he actually won't. He ended up replacing Mario, Rosalina, and Jeffy, and changed various minor things, and left Mario with a bullet wound and his mustache shaved. He later reappeared in Logan Reacts: Jeffy's TV Show, where he reacts to the video along with Logan.
- He was confirmed to be 23 on an Instagram post.
- While Logan enjoys Tito playing as Dewey, everyone hates him because of him conning Mario.
- Donedidit is similar to Al McWhiggin, the guy who stole Woody in Toy Story 2. Both characters have a like of money. Tito's voice and appearance are similar to Al's actor, Wayne Knight.