Did you know that (mostly) frightfur doesn't lock you out of other extra deck types? I've literally never seen anyone synchro or xyz summon with it though, which is a shame. Anyway here's what I got.
In terms of main deck, you've got basically pure frightfur, with the exception of dinowresteler coelasilat. coelasilat specials itself pretty much any time you need it to and its a level 2 tuner. Otherwise though, its frightfur gas.
Your best boards are obviously going to be mary and then something else, with the ideal best of the best board being chenying and mary.
you also have a generic 6, 7, and an 8 (I swear they come up more often then you think) and a rank 4 (doesn't come up as much, but still happens occasionaly)
Simple to play in theory, but incredibly skill based in practice. It's also incredibly funny to watch people target mary, banish a frightfur to negate it, which procs swordsoul for two more banishes. Only works once but its comedy gold.
Happy dueling
-Ornge