I can go on forever about how much I love serperior. It became my favorite pokemon the moment I saw it. It's design is simple yet effective. It flows elegantly with no extra spikes or bumps. I was a little put off by how it lost its legs when it evolved, but I got over it when i realized that the design didn't need legs to be great. In terms of design, snivy was everything that treecko wasn't. Before the snivy line was a thing, my favorite pokemon was actually sceptile. However, I really don't like treecko. I just don't like its weird toes and chubby fingers. I know they are supposed to be gecko toe-pads, but they look a little too anthropomorphic. I was glad that grovyle and sceptile fixed that. Snivy though, looked perfect. It was snaky with little reptile limbs. It looked so smug and sharp with those adorable glaring eyes and those yellow collar buds. I also really enjoy servine with its stegosaurus-meets-tree snake design. Serperior I already talked about...
I don't think I have ever liked a pokemon this much before. During first gen, it was charizard, second gen was typhlosion, third gen was sceptile extending onto fourth gen. I mean I liked them a lot, but I never went out of my way to buy merchandise featuring them. You should see how much snivy/ serperior stuff I have ranging form plushes to keys chains to EVERY SINGLE serperior card.
Even though serperior was easily the worst out of the three Unova starters, I still went with it. I stuck with it through white, black AND white 2. I started to replay black with an oshawott, but that thing was just a little too disappointing. I restarted again with tepig and that thing was a monster. However, it still couldn't compare with serperior. I'm also super happy that contrary serp has finally been released albeit a little too late. It would have been crazy in gen five considering that T-flame wasn't a thing and that serp could have still used its most popular movesets today back then.