Majin Ozotto is a character that will most likely come in the future episodes [Episode 3 most likely] and there is no current reference [as far as I'm aware of] of how this character sounds like. However, he may most likely have a low pitch evil voice similar to Dabura for example.  [Note: I am adding this role as this character appears in the manga during the Vegito Vs Cumber fight which will be Episode 3, and we suspect this villain may be in the anime too. If the villain does not appear in anime, you may not have any lines to do for it then.]