Sheesh, no reply in months? Whatever. I like ALL 100 episodes, to be perfectly honest. But, I must say, I LOVE episode 15. That robot dog was so adorable, and it even commited suiced for Kirby. It makes me cry. I also liked 41 and 42, also made me cry. The last 5 were impressive, too, however they weren't subbed so I only understood a few words. However, the battle against Nightmare was pretty short. Built up for 100 episodes, and the actual fight is a few minutes long.
Return to Dreamland, Mass Attack, and Air Ride are the best Kirby games. In no particular order.
Best Hoshi no Kirby characters:
4. Meta Knight
5. Customer Service.