Anyway I can talk to other Clients through a local script?

You can use either through client-server-client by RemoteEvents, or client-client (also server-server) by BindableEvents. But I recommend using RemoteEvents instead. It's because BindableEvents might only fire to one client (not sure), while RemoteEvents can choose any client.

First, you will fire the server and pick the player (other client) you want to communicate with as the first argument.

RemoteEvent:FireServer(otherPlayer)

Next, you will ccreate an event listener for that RemoteEvent, and for this one, just fire this back to the client and set the first argument as the otherPlayer.

RemoteEvent.OnServerEvent:Connect(function(player, otherPlayer)
    RemoteEvent:FireClient(otherPlayer)
end)

And lastly, you create a handler in the client script.

RemoteEvent:FireServer(otherPlayer)

RemoteEvent.OnClientEvent:Connect(function()
    print("Other client has communicated with you.")
end)