This is kind of interesting. Though I do wonder a few things.
Would you like it to be so that when you /ignore that person the game will keep ignoring him/her/it even when you for example rejoin the game?
Or do you want it so that you will have to /ignore the person every time you join a room with that certain person?
I think that in both cases it might be interesting adding an ignore list which can be cleared, for example /Clear Ignore, to clear the whole list and /Clear Ignore [Name here] to ''unignore'' the person.
Though I think it might be a good idea to make it immune to Gamemasters or Admins for example, in case there needs to be talked to a certain person because of a scam or something. Because if they could be ignored it could possibly be used against them.
Just a bit of brainstorming here, if you don't like it just /ignore.