Ray Palmer also, without changing his overall size, can shift the entirety of his strength into his fists, allowing him to deliver devastating punches of a superhuman level, which probably makes his skills in swordsmanship especially dangerous as well.
Hell, he can even shrink small enough to travel through electric currents: a favorite transportation method of his.
The Atom not only can retain his level of mass, but can control it to varying degrees, to the point at which he could make himself light enough glide with strong winds – unlike Ant-Man’s requirement to call upon his insect friends to fly.