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I love vintage Pikachu so much. OS Pikachu was really sassy and cute. I liked when Pikachu wasn't such a goody two-shoes and was occasionally rude or mean-spirited when he wanted to be. Still a good guy, just not the soulless Lawful Good character he's been since Sinnoh/Hoenn.
Also, I used to think Pikachu was female up until Princess vs Princess. I also kind of wanted Pikachu to be a girl so I could self-insert as him better but he is what he is.