He is scared of  Saitama who is a looking bald man with brown eyes, a thin but well-built physique, and is of average height and weight and Saitama is one punch man he can knock someone or even kill someone   with one punch and Sonic is Submissive towards him and is scared to fight him and he even acts like a pet around him  and he never wants to make him mad and He acts like He is Saitama property and will do anything to not fight him and he’ll even be his pet and do anything to please him  