Jack & Elmo are a duo competitor in the King for Another Day Tournament. The duo consists of Jack Black and Elmo, and the competitor is a reference to Jack Black's appearance on Sesame Street. They were selected by the art team.
- See the main article: List of songs featured in rips.
Jack Black appears in a few rips, either with songs from the band Tenacious D, or as himself from the Sesame Street episode in a YTPMV style.
- "Hey, how’s it going? He’s Jack, and with his friend Elmo, he’s going to educate the tournament on the magic of octagons! Complete with a stop sign and great tunes, Jack and Elmo will stop at nothing to become the kings of this tournament."
- —Jack & Elmo's description on the MOJO!!
Jack & Elmo were revealed in the "SiIva Direct • SiIva Lighthouse Live ∣ E3 2019". Their source list includes rips related to Sesame Street and The Muppets, rips related to Tenacious D and Jack Black, and rips related to edutainment games.
Lines in bold were used in the tournaments.
- Jack and Elmo have the record for closest match winner yet, beating Rhythm Masters by only a 20 vote difference.
- According to BobTheTacocat on Discord, Jack & Elmo have edutainment game rips since the SiIvaGunner channel is about "video games".
- Their vs. quote against Metal Ajit Pai references their first encounter with Jack Bros. in the Mojo which was first mentioned in Jack Bros.' interview, and was also mentioned in their interview as well.
- Their vs. quote against Off the Hook ft. Paruko references Jack Black's "Eight awesome angles!" line from his appearance in Sesame Street.
- Their quotes against "Weird Al" Yankovic reference Jack Black's appearance in the video for Weird Al's "Tacky".
- Their vs. quote against Pitbull and the Aliens includes Elmo mistaking either Marcianito or Popoy as Kermit due to their green and thin-like appearances.
- Their victory quote against Pitbull and the Aliens references the movie Nacho Libre, in which Jack Black plays as the main character Ignacio.
- Their quotes against Nintendo Power references the many times Jack Black couldn't get his Elgato to work in some of his videos on the channel JablinskiGames.
- Their quotes against Men in Black reference Sesame Street characters The Martians.
- Their victory quote against Men in Black also references Jack Black's "Come on, let's go find an octagon!" line from his appearance in Sesame Street.
- Their victory quote against ZUN references the game Brütal Legend, in which Jack Black played the main character Eddie Riggs.
- Their vs. quote against Thanos is a reference to the Gauntlet of Wooden Warriors, which are rotating, steel-studded wooden posts from Kung Fu Panda.
- Their quotes against Wario Partners, LLP references Wario: Master of Disguise and another of Jack Black's appearances on Sesame Street where he calls himself a "master of disguise".
- Their vs. quote against King Dedede includes Elmo mistaking him as Big Bird, as both are yellow and have bird-like appearances.
- Their victory quote against King Dedede is a reference to the video The Glorious Octagon of Destiny where a part from the Eric Andre show plays during the Hilltop Chase section.
- Their vs. quote against Solid Snake references Jack Black's role as Po in the movie Kung Fu Panda.
- Their victory quote against Solid Snake makes a connection with the common octagon based on the stop sign from Jack Black's appearance in Sesame Street and the Metal Gear character Dr. Hal "Otacon" Emmerich homophone mixup.
- Their vs. quote against DJ Professor K and victory quote against Nico Nico references Jack Black's "Eight glorious sides!" line from his appearance in Sesame Street.
- The victory quote can also be seen as a reference to the famous YTPMV "8 Sides of Nico Nico Douga".
- Their victory quote against DJ Professor K references the Sesame Street segment "The Letter of the Day".
- Their vs. quote against Adam Levine references American actor Adam DeVine, a person Jack Black met.
- Their victory quote against Adam Levine references the Maroon 5 song "Payphone".
- Their vs. quote against Johnny Bravo references Jack Black's roles in various media.
- Their vs. quote against Mr. Krabs references the Sesame Street character The Count.
- Their victory quotes against Mr. Krabs is a reference to the face that Jack Black hosted the Nickelodeon Kids' Choice Awards at least 3 times.
- Their victory quote against Daft Punk ft. Pharrell references Pharrell Williams' appearance on Sesame Street.
- Their vs. quote against Papyrus references the character Mr. Noodle, a silent character who appears in the Sesame Street segment "Elmo's World".
- Their vs. quote against Dr. Piccolo references the "D is for Doctor" segment from the Sesame Street episode "Abby Helps Clear Things Up" and the Daily Dose meme.
- Their vs. quote against Jack Bros. references the film Tenacious D in The Pick of Destiny, in which Jack Black's character has a rockoff with the devil.
- Their victory quote against MissingNo. is a reference to a news article explaining a defective "Elmo Knows Your Name" toy that says "Kill James".
- Their vs. quote against The Jazz Cats references the Sax-A-Boom instrument that Jack Black usually plays.
- Their victory quote against The Jazz Cats references the Tenacious D song "Simply Jazz".