Let's look at it from another perspective...
One of the starters will have to be stuck up and French-like the way Serperior is.That,from the evidence we have,might be Froakie[the glasses,etc].
One of them has to be based on japanese folklore,or some other japanese thing[the way Samurott was] and I believe Chespin will fill that role.Hedgehogs are nocturnal and quite predatory despite their cute appearance...A ninja would make sense.
And finally,there's Fennekin.I personally believe it'll have a more Taoist origin,its tail and ear fluffs might "bloom" into lotus flowers as it finds wisdom and enlightenement.
Chespin-Grass/Dark with high attack and speed
Froakie-there are so many posibilities with this one...could be Water/Fighting but a really stuck up one>.>
And Fennekin-Fire/Psychic with high sp attack and special defense and maybe speed too.
My friend code is 2964-9561-7279 and my name is TATI