is it possible to see Flags/Countrynames ingame?
So you know where People come from who join you game, like with Banlist in DotA.
Hello my name is John Rager or Sir Rage Alot or Trashcan
Nope. Not possible at this time. S2 talked about possibly adding this functionality to game lobbies, but for now, it's not possible at all. HoN and Warcraft 3 use very different ways to connect players to host. HoN uses their own servers, Warcraft 3 hosts a game on the host's computer, without a server middle-man.