Dunno what makes some of you think that Sonic and Sasuke are alike. ŋCause they have black hair? If its cause he wants Saitama to fight him, in some egotistical/childish way (actually I think that Sonic is plain psychotic), he should remind you of Naruto, Lee and a lot others to cause basically the "fight me!" behavior is related to 1/3 of conceited shounen characters ever.

He isnt emo, he isnt sulky, he isnt secretive, he isnt vengance driven, he isnt elite, he isnt cool and composed... So black hair and ninja 100% match duh.