If you have already played the mobile game known as Era's Adventure, you already noticed that the main character is Yoshi. Here is an answer from the developer, Botond Kopacz on why Yoshi is in the game.
"Actually this is an indie game developed by one developer, so due to the limitation of effort, I purchased a cute character from TurboSquid, one of the biggest 3D asset stores, without knowing the background story of the character Yoshi, since I'm not a Super Mario fan,"
"Once the game was released on the Play Store, after spending hundreds of hours in making the game, I started receiving 'kind' mails from Super Mario fans that I stole Yoshi, etc. So I started Googling and I realized that the character is really from the Super Mario series," Kopacz said.
But even after hearing about the problem, he says he didn't find anything related to the specific 3D model of Yoshi in the US copyright, trademark, and pattern database. "Since no assets are stolen from any Nintendo game or website and the Yoshi's name is not present anywhere, there is no copyright violation. [There would be] at least pattern violation if the 3D model is detailedly registered in the US pattern database."
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