From the Super Mario Wiki
“I feeel good now!, I feel good.”
Elvin Parsley is the popular King of Sockhop Land, though he is also known as the king of rock and roll. He appeared in The Super Mario Bros. Super Show! episode "Elvin Lives". Kool Koopa froze him in a freezer and took over, but the king was freed thanks to Mario, his friends and Elvin's magical talking shoes who speak separately by rhyming.
He has a red jacket, a pompadour hair style, and is constantly twitching. He moves his hips around recklessly.