My favourite starter is Feraligatr. When I played Pokemon Silver for the very first time, I found myself loving the design and color of Totodile, so I chose it. And every time it evolved, it became more and more awesome. They also learned the move Bite, which I grew to love.
I also really like Venusaur, Charizard, Blastoise, Sceptile, Blaziken, Swampert, Infernape, Empoleon, Serperior, Samurott, and Greninja.