Kirby: Star Allies teased one of the upcoming Dream Friends set to join in the summer update last week, and it turns out that the mystery character was actually Jigglypuff Daroach from Kirby: Squeak Squad seen from above.
This falls in line with what has been datamined before regarding the upcoming Dream Friends, which you can find in the link here.
Here’s Daroach’s look in motion below:
— 星のカービィ (@Kirby_JP) May 22, 2018
Kirby: Star Allies is available for Nintendo Switch.