There are actually two Kings in the series, both of whom wore a jaguar mask in matches.
The character was inspired by both legendary Japanese pro wrestler Tiger Mask, as well as Mexican wrestler Fray Tormenta, a Catholic priest who became a masked wrestler in order to support an orphanage.
King does not speak, per se. Instead, he makes growls and snarls in the manner of a jaguar, which are translated into English subtitles at the bottom of the screen. Interestingly, other characters do not have a problem understanding King, and converse with him as though he was speaking naturally.