Ludo

Ludo is the main antagonist from the Disney XD seires Star vs. the Forces of Evil, voiced by Alan Tudyk.

Background Information
Ludo is a seemingly powerful villain with many henchmen at his disposal, and is seemingly Star Butterfly's worst enemy, as the way they speak to each other seems to indicate they had met prior.

Trivia
Ludo is the 4th Disney character voiced by Alan Tudyk. The first 3 being King Candy from Wreck-It Ralph, The Duke of Weselton from Frozen and Alistair Krei from Big Hero 6.