MMO factors for my game.

1) New players arriving balanced vs longer term players.
- Lower level players are shielded, and even then people are unable to attack lower level people (game characters)  Immortals can not fight directly in any case.

2) Player vanishing?  (login / logout.)
- The game continues even if the player is not logged on.  When items are done, the places go on pause automatically.   When the player is in-game as a person (game character), and gets disconnected, the person finishes combat as best they can, and then searches out an Inn or safe spot and waits.  For a while, until the person has a need and risks themselves.

3) Vanishing player's scores?
 - Kind of irrelevant because scores stay in place… unless your person dies before you can log back in.

4) Advantage to logging out?
- None,  All items, people, stay in the game without regard to player login status.  The AI will do its best to keep the player's person alive.

5)  Not a Turn Based Game.

6) Chat protection?
- Custom chat filters, ignore/blocking system.

7) Collusion?
-  Each player has a like/dislike rating system with each other player.   All of the player's people act accordingly (mostly).