Chespin seems to resemble a tree - the head is compared as leaves and the body the lower part of the tree.
Chespin is the first Grass-type starter Pokémon that is not reptile-based but based on a mammal, in this case a rodent or a marsupial.
Chespin will be the third grass starter to stand on two legs, with the first being Treecko and the second being Snivy.
Chespin bears a resemblance to Generation V starter Oshawott.
The theory that the three Gen.6 starters might evolve into a grass/dark, fire/psychic and water/fighting types may be true since in the game trailer Chespin is seen using a move that might look like Night Slash. This would then make each starter effective against the starter it is usually ineffective against - in this case, Chespin would become effective against Fennekin, but weak against Froakie.