[Markus_Whiteus]

you could add prefix[definelengthhere] e.g prefix[20] to the enum then when you want the prefix to show call it there with PVar[playerid][prefix]

so like,
format(string, sizeof(string), "[%s]%s says:",PVar[playerid][prefix],[PVar][playerid][name]);
SendClientMessage(playerid, -1, string);
as an example