Many Nickelodeon fans noticed a significant omission of characters from the series The Fairly OddParents in Nickelodeon crossovers starting in 2008's SpongeBob SquarePants featuring Nicktoons: Globs of Doom, which was the final installment in the Nicktoons Unite! series where Fairly OddParents protagonist Timmy Turner had previously been part of the main ensemble cast. The reasoning for this is believed to be due to Nelvana, a Canadian distributor of children's content, holding the international licensing rights and copyright for the first 5 seasons of the show outside of the US, having used this to syndicate the cartoon on the rivaling Disney Channel.

This absence was eventually broken when Timmy Turner appeared in the 2022 Apple Arcade game Nickelodeon Extreme Tennis, and has continued to make sporadic appearances as a playable character since. In response to a tweet speculating that this could lead to Fairly OddParents content appearing in Nickelodeon All-Star Brawl, the community manager for the latter game Thaddeus Crews posted a "heads-in-the-clouds" emoji, and this ultimately did not happen for either fighting game. A playtester for Nickelodeon All-Star Brawl 2 alleged that the legal issues with The Fairly OddParents are so complicated and strung-out that a former Nickelodeon or Nelvana employee was gifted the copyright to Timmy Turner's pink hat design as a farewell gift.