Took me a while to do Fennekin because I had no idea what to do with him. I knew I wanted to go with the 'noble' idea, and I maybe wanted to add a big poofy tail skirt...but that idea didn't really work for both genders so I split it between the two.
The names are bad and I feel bad. Also they ended up looking more macaw-like than I anticipated. But oh well!
My ideas are that the female evolves to be a special attacker and the male is physical.
Other XY Evolutions:

Dignifire would need to have the same gambit as the Nidoran lines, where they are two very clearly distinct species in name, (like how we have Nidoran Female and Nidoran Male) in order for them to have different stat spreads and level-moves.
In addition, you would only have a 1/8 chance of getting the special attacking female because of Starter Gender rates.
And about thinking a design being too effeminate for male pokemon... um... I point to Gardevoir, Gothitelle, Ninetales and Delcatty? Especially Gardevoir and Gothitelle.
(I actually really like the female Dignifire design. Its got such a refinement to it.)