About that
Fire Lion you guys wanted.
Ever heard of...
?
Entei is as unique a Fire Lion as you're going to get. He's perfectly designed.
I still like the Red Panda idea so much more. Oh, and awesome sprite Greenstreet

Although, I see it as a 2.5 stage Pokemon, meaning that it doesn't work as a 2nd or 3rd stage form. It either needs to be downgraded a bit so that it fits the 2nd stage prerequisites, or it needs to be buffed up to be a proper 3rd stage. I do love the idea of a Zebra grass starter though. Absolutely.
One thing I'd like to note though: there has not been one mammalian Water or Grass starter yet. Only for Fire have we seen any mammals (Typhlosion and Infernape families).
If we're going to give Grass a mammal this time around, then maybe we should hold back on giving Fire a mammal also. Here's how it's been for all four generations:
GRASS: Reptile / Reptile / Reptile / Reptile
FIRE: Reptile / Mammal / Bird / Mammal
WATER: Reptile / Reptile / Amphibian / Bird
Grass obviously needs a mammal, because bird is too close to reptile. Fire could do without another mammal (but it would still be welcome). We do not need another bird for Water, but a revisit to reptile or amphibian wouldn't hurt. A mammal would be the best choice for Water though. My proposed setup would be:
GRASS: Mammal
FIRE: Reptile or Insect (or Mammal)
WATER: Mammal
If we go the full Mammalian route, then it would be a complete contrasting generation to the 1st Gen's starters. That
could be interesting.