he just talks in his own voice

He's spoken about that recently in the Daily Show.

Most actors who didn't grow up speaking English take voice lessons to blend in. Ronny says losing his accent would be hiding who he is, and he's not ashamed of it.

The downside to that...

Is he's a pretty dog shit voice actor. Virtually every other actor at his level could easily throw out any number of perfect accents. Like all those English actors who speak perfect American while filming a movie. And as soon it wraps it's all "Pip pip, cheerio" and their normal voice freaks you out.

Or Stephanie Beatriz from Brooklyn 99, it's freaky different when she uses her normal voice.

Ronny is just Ronny, sometimes he's not the best fit. But he absolutely shines in the right role, even if he gets typecast because of it