The term multi is a similar idea in that it is heard in a wider variety of genres, such as strategy games where players control something other than a character. Multi denotes the use of an alternate account to the advantage of the primary character, which many games consider cheating. Multis allow a player to explore more possibilities than he could with only his main character alone; for example, many role-playing games have classes (such as Fighter and Wizard) that restrict the gameplay (fighters cannot cast spells), and a player may want to create several characters to explore all of the possibilities. Multis can also help a player accumulate loot for his main character more quickly. The act of playing several characters at once is called multiing.
Multiing creates several gameplay problems, especially if these characters begin to interact with each other. Weaker multis could gather items in several areas and send them to the main character, so that the main character would get much more loot than if he would search for it singly. In the games where multiing can get serious benefits for a player, it is looked down upon by purists and is considered a form of cheating. For example, in Kingdom of Loathing using multis for profit is a punishable offense.
Read more about this topic: Alternate Character