No. 1: Enter The Ant-Men
There have been three people who have taken up the mantle of Ant-Man in the comics. The first, of course, is Hank Pym, the original Ant-Man and a founding member of the Avengers. Let us not forget that he also created Ultron. The first Ant-Man certainly accomplished a lot in his somewhat lengthy superhero career.
The second Ant-man was Scott Lang, an electronics expert who had to take up burglary in order to help support his family. These two characters, of course, are the stars of the Ant-Man movie, with the third and lesser known Ant-Man going by the name Eric O'Grady. Unlike the first two characters, Eric didn't have any special skill sets and worked as a low level SHIELD agent before accidentally coming into possession of the suit. Instead of acting as a superhero, he initially used the suit to stage races between the Ant's living in the SHIELD helicarrier ventilation shafts and spying on women who were in the shower or in various stages of getting undressed, various superheroines (like Ms. Marvel) often being targets of his.
So, yeah, he was basically a sleazebag with shrinking powers