It seems that a game known as Nickelodeon All-Star Brawl has recently been listed for Nintendo Switch. This has sparked speculation that the title may be coming to the hybrid console.
As you know, this title has not been officially confirmed for Nintendo Switch. However, Gamefly has listed it with GameMill (Nickelodeon Kart Racers, etc.) as responsible for the title for October 5th of this year. From the name, it’s speculated to be a fighting game featuring Nickelodeon characters.
The image that comes to mind is the one above, although unfortunately there are no official images of this release at the moment and it’s just fan-art inspired by Super Smash Bros. from SourceGaming.