He's 1 of the 11 Supernovas. He had one of the higher bounties. His power is sound based and he can attack with his music in the worm of sound waves similarly to Zebra. The problem is that he hasn't shown even 1% of what Zebra can dish out literally. Zebra's on country level+ but Apoo hasn't shown above city block level in scope and his potency is less as well. Even if Zebra didn't use his voice, he could 1-shot Apoo with his Toriko level strength.