Florist
: Exchanges plants for other plants
Ex: One sapling for another, Poppy for Yellow Flower, Lilac for blue bells, etc etc
Mason
: Allows the purchase of building materials in bulk
Ex: A stack of stone bricks for like, 3 emeralds or something, I dunno. A stack of logs for more than 3 emeralds maybe???
Elixer Mixer
(get it?): Buy potions for lots of shiny stones. Those things aren't cheap
Ex: see above
Vexillologist
: Can purchase banners in certain pre-made styles
Ex: The banners all around spawn. I like those.
(fun fact, Vexillologist is the term used to describe those who study flags and the history of flags!)
Sheppard
: Can purchase wool, and mutton.
That's it.
-Bad Ideas-
You spoke, you did.
I see the error of my ways.
Shifty Dealer: (You gotta be good at tracking people down, this guy won't sell his rare goods in the open!)Sells things un-obtainable in the game for outrageous prices.Ex: A notch apple. The glowing one. A stack of emerald blocks for 2. Maybe.
The Headsman: He trades a stack of a certain monster part for the head of that monster.Ex: a stack of gunpowder for a creeper head, a stack of rotten flesh for a zombie head, etc etc.