You know how people speak and act differently depending on who they’re around? Different body language and choice of words for their family, their friends, strangers, authority figures, and so on. That’s called code-switching. 

Jebediah code-switches more smoothly, more thoroughly than any other fictional character I’ve ever run into. Body language, word choice, gestures, even accent. His ‘neutral’ accent is unidentifiable because it isn’t really any single accent, it’s a blend of multiple things, but most closely sounds like it’s from somewhere in Africa. 

From there, he can swing to any accent he’s heard for long enough, and it doesn’t take him long. Far less time than it takes for him to figure out the right body language to use in the situation. This makes for a rather hilarious contrast sometimes, if his body language is somewhere refined and withdrawn and his word choice and accent are starting to slide into something less so. Or the other way around- posh English accent is hilarious when paired with Italian phrases and body language. 

Once it all settles, though, it’s perfect. Helps him get along with people a bit better if he can accurately mimic local mannerisms, and none of it is a lie, after all. It’s not faked, and it’s not even intentional any more. He tries to fit in, is all.