Farfetch'd, which I conceptualise as a traditional swordsperson. My 'character interpretation' of it is similar to the official one of Monster Hunter's Yian Garuga, which is known as something to the effect of 'lone wolf wyvern', though it's more gastornis-esque, and is (or was) one of the more challenging monsters to hunt. Farfetch'd is ultimately a joke character, originally having been offered in a trade at a level which one wouldn't be able to control it, as well as having poor base stats ranging from 55 to 65, but that can make it quite interesting to work with.
I'm also fond of Archeops and Jolteon, the latter of which I have been keen on since Pokemon was around in the West.
As far as interesting concepts go, I actually like the basis for Mawile and Froslass the most; might make a yōkai-themed team sometime.