Master Gouken’s other pupil and Ryu’s best friend and rival, Ken’s life and personality could not be more different from Ryu’s. Heir to the wealthy Masters family, Ken was sent to master Gouken to be taught discipline, as he was getting too spoiled. Though Ryu and he trained together, Ken developed his own personal style, and went on to win the US Martial Arts Tournament. Fun fact: Ryu’s iconic headband was actually a gift from Ken.

Ryu's best friend and rival, Ken Masters, made his debut at Ultimate as his Echo Fighter. Unlike Ryu, who's serious most of the time, he's got an upbeat and cheerful attitude, making him hard to be disliked. This doesn't mean he's carefree, though. And him being a worthy opponent to Ryu gives the fact that he's not to be underestimated. And like Ryu, he's also acquainted with Mega Man, becoming a member of the "Capcom Challengers", considering he's from the same universe as them.

For his voice, I'm looking for someone who can sound like Reuben Langdon's take on him. Check out this link for reference:

https://www.youtube.com/watch?v=WCkBOiwWcn4