A main refers to when a video game has multiple characters/weapons/profile to choose from and a
gamer has chosen a particular character he specializes with, usually for online
play.
Mains are chosen usually as their game play characteristics caters to the style of play of the
gamer. Although some mains are chose out of media popularity of the character despite their inherit weaknesses (
ex. Cloud Strife in Dissidia, Link in Soul Calibur, etc.).
Noobs often main characters which they can spam (repeatedly use the same move over and over with relative success in gameplay)
After playing Super Smash Bros. for a few weeks and going through
Fox,
Sonic, Marth, and Bowser, i have decided just to make Link my main because i think he has some extreme potential.
That noob mains Automatic because you can spam the a
button and still manage 3000+ points.