Here are my foils:
OK this is just a start but:
Foil! Twilight (occupation undecided) is a bit of a brilliant but lazy frat boy as opposed to Twi's studious bookworm persona...never panics, master of the indie ploy and improvisation. Agent Moulder to her Agent Scully. Has a green baby girl dragon named scales. Is comepletely unadorkable.
Foil! AJ is an Earth Pony trucker...as in he is the truck! Large and immensely strong. A native of Manehattan...still has elements of the accent. Nice, but with elements of the scary black man. Clumsy, little common sense, panics easily.
Foil! RD is a Pegasus firefighter. Skilled, loyal, awesome, but calm and composed, and introverted. Confident in his abilities...but dosn't like being the center of attention.
Foil! Rarity is a Unicorn blacksmith and artist...artistic, generous, hard working...but uncouth, scuffy, grubby and tasteless. Often covered in soot. Chews with his mouth open, spits, dosn't shave often etc. Still an overdramatic large ham.
Foil! FS is a Pegasus and the town doctor...unlike FS, he is forward, forcefull, even jerkish, fearless and completely unapolgetic...but has a heart of gold and will stop at nothing to save ponies and help them with their problems.
Foil! Pinkie works at his aunt and uncles pizza place and often does street entertaining...just as wacky and as random as Pinkie...but is completely silent and never says a word. Has a parrot to do the talking. A reworking of my magic mime idea...he may still get the powers.
Tealove is best pony.