They're all doing a great job and I'd love to showcase them as much as possible. And thank you. It's unusual for people to show such an interest in an OC, as opposed to fanart of an established character, so it's always lovely to hear that.
James's voice actor is an actual Brit, yes, but Santiago and Louis are voiced by Americans. Louis's voice actor, however, does have a France-French friend who helps him with the accent and the words where she can.