...Something like that. Class would be either EAT/Especially Advanced Talent (Soul Eater) or NOT/Normally Overcome Target (Soul Eater NOT), Abilities for Meisters would be stuff like Soul Menace or special traits, everything else is easily explained.
As for a plot... Soul Eater 1964 I got no serious ideas at the moment.
As for the plot I've got a small idea. I might go searching through Soul Eater fan fictions. Try and find a plot but I'll see what my plot idea will bloom into...