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Scott Lang aka Ant-Man II
I know Hank Pym is the original guy, but when I first read Marvel, Scott was wearing the costume, while Pym was semi-retired, so I always enjoy Scott popping up, like last year in the FF series by Fraction and Allred.
It was legendary when he and the Wasp single-handedly took down Titania and the Absorber in The Avengers #275. A nice roundup about those formative years of his career can be found here