Gyro is a main character and ally to Johnny.

Gyro is a man of average to above-average height and medium to athletic build. He has hair that reaches mid-back, light eyes, square patches of facial hair lining his jaw, and often painted lips. He either wears grills or prosthetic teeth reading "GO! GO! ZEPPELI". 

Gyro initially appears as an aggressive contestant in the Steel Ball Run race. Unlike other competitors, Gyro looks to seize the first place above all else, rushing ahead of everyone then fending off anyone who challenges him. He also has a tendency to take dangerous shortcuts. Gyro is a rude man, deriding the vast majority of those he meets with insults and mocking commentaries. Even with his closest friend Johnny, Gyro doesn't mince his words and sometimes argues with him. Moreover, Johnny only made a lasting impression on Gyro through his dogged stubbornness and otherwise looked down on him during their first meeting. Gyro's overconfidence extends to his fights, during which Gyro is prone to mock his enemies in some way or say something brash.

Gyro's voice should reflect his cocky, brash, and flamboyant nature, with a breathy confidence even in hardships. Do not be scared to be goofy and yell.

For vocal inspiration, Check out his Japanese voice.