MSProj - Monolith Soft Font Projects - Sets up font icons & other properties?
NPC - Non-Playable Character
PS - Passive
PC - Playable Character
RLT - Relate/Relation
Scn - Scene?
Scenario Flag - Main quest progress as a number. (Refer to MNU_scenario)
Telop - "The term telop is used in Japan (テロップ, Teroppu) to indicate text superimposed on a screen, such as captions, subtitles, or scrolling tickers."