Try making a simple IP block list for example:
You will need the following:
1 Variable
1 Event
1 Condition
1 Common Event
Set up a common event, and title it Block List, and put keep it's trigger on (none).
Then go to the first map where everyone is spawned, and title it Block List Call.
Set it on auto start and put in the following:
Call Common Event: Block List
Erase Event
In the Common event create a variable and name it Blocked Name, then make it something like this Blocked Name= (*Player Name*)
Then make a condition event that looks something like this (If Block List=*Player Name* call game over)
#Block List
<>If Blocked Name= *Player Name* Then Call Game Over
<>If else Do Nothing
If you have it make them get the game over screen enough then they should naturally just back off..