Vince Fontaine was a radio announcer, first heard during the animated title sequence. He is played Edd Byrnes in the 1978 movie, and by Mario Lopez in the 2016 Live Performance.
Jeannie From The Ellen Show Plays His Assistant in "Grease Live"
Vince also had showed himself to be a pedophile during the dance, flirting with Marty, apparently also putting aspirin in her drink. He also flirted with Principal McGee during the dance.
Marty ditched him after she caught him slipping aspirin into her coke.