Outside of 1-2 Switch (which, while successful, doesn't really lend itself towards a potential character in Smash), the Switch has brought us 3 successful new IPs as of when this thread was made (poor Sushi Striker).
- ARMS, Nintendo EPD's new 3D arena fighting game IP which came out within the first few months of the Switch and sold well over 2 million units (& only missed out on getting a playable character in Ultimate due to poor timing).
- Astral Chain, Nintendo & PlatinumGames' recent collaboration that has gone on to sell over a million copies with a critical acclaim to match.
- Ring Fit Adventure, Nintendo EPD's unique new take on fitness games that has sold well over 2 million copies in a matter of months with no sign of slowing down.