I found this on another RP site and I think it really helps you understand what it is.
Power Lusting: aka God-modding
Click here to go to Wikipedia's definition of Mary Sues.
The basic definition of a Mary Sue is a perfect, invincible character with no weaknesses or flaws. They outshine everyone else. Sometimes they breed with their favourite canon characters (but you're allowed to do that in Worlds 2, 3, 5, 8 and 11).
To avoid making a Mary Sue, try adding a few flaws or disadvantages to them, like in their character, general health (they could be asthmatic, slightly chubby or short sighted) or in their control of their ability (please don't go overboard with the loss of control of ability though if you decide to do this). You don't need that much. Just don't make them completely perfect. No one is completely perfect. Remember fatigue as well! They don't have an eternal source of energy for living on and using their powers from. They're not gods.
On the other hand, please don't go overboard on the weaknesses! You don't want your character to be a complete failure! You only need a few small ones, not dozens of big ones! A character with dozens of flaws is known as an Anti-Sue and you can tell that the creator of them has piled on the weaknesses to avoid their character being labelled as a Mary Sue. Anti-Sues can be just as bad as Mary Sues.
Power Lusting: aka God-modding
- Definition of Godmodding (or Godmoding)
In an online RP, Godmodding is the term used for those whom create a character that is, virtually, indestructible. This is frowned upon by other members of the RPG and is extremely annoying. This can also result in a possible ban.
- Godmodding in general
Godmodding occurs when a player A describes an event, or a series of events he/she has taken against player B in the RP. The person who plays character B describes actions taken that completely nullify the original actions against them.
For example:
player A: "Joe strikes out at George firing a machine gun, launching a grenade at him and pulling down the walls around him."
player B: "Joe completely misses George as he dodges the bullets, picks up the grenade and throws it back and jumps away from the falling walls."
***SOMETHING had to hurt the character, even if he only got shot in the shoulder or piled on by the wall and emerged with a broken wrist.
- Godmodding is used like a "Get Out of Jail Free card" when things don't go the way a player wants. Rather than working with previously unfolded events, a player will godmod to get things going their way. It is used to make a certain character invincible.
- Godmodding can also refer to where character A describes the outcome of their own actions AGAINST another character. For example, character A states: "George lashes at Joe with his sword, creating a huge gash in his cheek."
- Controlling characters that ARE NOT YOURS to begin with is also godmodding.
- Godmodding during fight scenes
Godmodding is most often used during fight scenes. While it is hard to determine what another character will do, you must always leave the option open for them to dodge, duck, run, etc. You may not state your attack directly hit them and they fell down, or anything of that kind.
- Godmodding and powerplaying/powergaming are, essentially, the same thing. In short, don't do it. It annoys other people and makes you look like a fool.
Click here to go to Wikipedia's definition of Mary Sues.
The basic definition of a Mary Sue is a perfect, invincible character with no weaknesses or flaws. They outshine everyone else. Sometimes they breed with their favourite canon characters (but you're allowed to do that in Worlds 2, 3, 5, 8 and 11).
To avoid making a Mary Sue, try adding a few flaws or disadvantages to them, like in their character, general health (they could be asthmatic, slightly chubby or short sighted) or in their control of their ability (please don't go overboard with the loss of control of ability though if you decide to do this). You don't need that much. Just don't make them completely perfect. No one is completely perfect. Remember fatigue as well! They don't have an eternal source of energy for living on and using their powers from. They're not gods.
On the other hand, please don't go overboard on the weaknesses! You don't want your character to be a complete failure! You only need a few small ones, not dozens of big ones! A character with dozens of flaws is known as an Anti-Sue and you can tell that the creator of them has piled on the weaknesses to avoid their character being labelled as a Mary Sue. Anti-Sues can be just as bad as Mary Sues.