Blaine is the 7th Gym Leader in the first generation of Pokemon. Ironically he's pretty easy to beat since it's a piece of cake to establish some good water pokemon to take down his fire pokemon.
Same goes for the rematch (sorta) in the 2nd generation. It was pretty interesting that his old gym was destroyed so he had to get a new one. Dumb volcanoes.
I did like Blaine in the anime, though the actual battle was forgettable. They didn't even copy his pokemon from the games. Weird.