Thread:RaijinRising/@comment-24573226-20161031202500/@comment-33293221-20161031203438

Well... they're still used in speech, but they're not right in writing, if that makes sense. We wouldn't turn in essays with those spellings.

I was unaware of the acceptance outside of the US, but in either case, the wiki uses American spellings, perhaps because RWBY is made in the US.