Dr. Robotnik is the main villain of the Sonic the Hedgehog series. He is a competitor in the King for Another Day Tournament. He was selected as a popular fan submission.
- Snooping as usual, Dr. Robotnik invades the tournament! With his hands on that crown, Robotnik may finally be able to fulfill his dream of ruling Mobius, and capture that heinous hedgehog he hates so much… or at least he thinks. However, if he truly wants a chance to be king, he will have to give himself a promotion!
- —Dr. Robotnik's description on the MOJO!!
Dr. Robotnik was revealed at the end of the SiIva Direct 4.1.2019. His source list was revealed on the MOJO!! It would include rips related to any Sonic cartoon before Sonic X, rips featuring music from any Sonic the Hedgehog game on a SEGA console (and Sonic Mania), rips featuring music from the Puyo Puyo series, and classic-style YTP edits featuring Dr. Robotnik.
Lines in bold were used in the tournament.
- Robotnik is one of 4 characters to be beaten in the first round, but eventually, rank higher than the character who initially defeated them. The others being Rhythm Masters, Mariya Takeuchi, and Johnny Bravo. In Robotnik's case, he outlasted Mr.Krabs.
- Dr. Robotnik was the first character to have a full arrangement. This being Quickly Difficult, an arrangement of a Faceoff at the Magician’s Tower! “Puyo Puyo Tsu" from Puyo Puyo 2. A secret mojo page was put up for the arrangement after Fleety found a security flaw after looking around the Mojo's codes. This secret Mojo page was only accessible through a link which can still be found here.
- His victory quotes against Metal Ajit Pai and MissingNo. as well as his vs. quote against Solid Snake references his infamous quote "Snooping as usual, I see" from Adventures of Sonic the Hedgehog.
- His vs. quote against Geno references the character Tails Doll from Sonic R, who Dr. Robotnik created.
- His vs. quote against "Weird Al" Yankovic references the original Sonic the Hedgehog (2019) trailer which used "Gangsta's Paradise", a song Weird Al has parodied.
- His vs. quote against Nintendo Power references the games Hotel Mario and The Legend of Zelda: Wand of Gamelon, which is usually associated with YouTube Poop.
- His victory quotes against Nintendo Power and Daft Punk ft. Pharrell references his lines from the Adventures of Sonic the Hedgehog episode "Tails' New Home".
- His victory quote against Nintendo Power also references Sega Sammy Holdings business magnate Hajime Satomi.
- His vs. quote against King Dedede references the video "King Dedede and Dr. Robotnik scream for 5 minutes".
- His victory quote against King Dedede references the "THIS VIDEO CONTAINS WIN" meme.
- His victory quote against Adam Levine references the Maroon 5 song "Misery".
- His victory quote against Mr. Krabs references the YouTube Poop "DINNER BLASTER".
- His victory quote against Mariya Takeuchi references the character Maria Robotnik from the Sonic the Hedgehog series.
- His vs. quote against Daft Punk ft. Pharell references the song "Get Lucky".
- His vs. quote against Jack and Elmo reference a video where Jack Black's appearance in Sesame Street is sentence mixed to say "wazgul is gay" (referencing then-popular YTPMVer wazgul), which was subsequently used as a source in multiple YTPMVs.
- His vs. quote against Jack Bros. references the Sonic the Hedgehog characters Sonic and Tails since the two characters shares similarities with them; Sonic and Jack are mascots of their home companies while Tails and Mothman has the ability to fly.
- His vs. quote against Nico Nico references his line from the Adventures of Sonic the Hedgehog episode "Sonic Gets Thrashed".
- His victory quote against Nico Nico references the "WHO'S AN EGGHEAD, EGGFACE?" clip from the Super Mario World cartoon which has been a YTP source ever since.