I have always had a second main; in fact, I believe that I am competent enough to main four or five characters effectively. After five; however, it is not necessarily practical. So I am not entirely sure who I should drop.
Usually, I main the Triforce: Link (Toon Link in Brawl), Zelda and Ganondorf. After that, my secondary mains are: Samus, Falco, I have been attempting to practice Marth, and I have a pocket Falcon (from extensive Ganondorf experience). I, unfortunately, dropped Jigglypuff in Brawl.
I was intending on picking up: Zero-Suit Samus and Charizard as they no long have detrimental mechanics attached to their characters. After that, I am most interested in the newcomers: Rosalina, Little Mac, and Palutena.
I am probably going to replace Palutena or something. It is difficult to decide. I am not a very effective tactician.