Board Thread:Off Topic/@comment-25239449-20170405160513/@comment-131168-20170405162612

MC most literally is "master of ceremonies" and can be the person introducing acts at a concert, but I think a lot of the time when you see things like "MC" or "MC3" and "MC4" in a tracklist for a concert it's not necessarily someone separate, but a shorthand for the members doing a talk segment or something.

KSS is shorthand for the Hello Pro Kenshuusei. Reason being the three Japanese characters that make up the word Kenshuusei 研修生 are individually Ken Shuu Sei.