Index: binaries/data/mods/public/gui/session/messages.js
===================================================================
--- binaries/data/mods/public/gui/session/messages.js
+++ binaries/data/mods/public/gui/session/messages.js
@@ -66,6 +66,8 @@
 		handleClientsLoadingMessage(msg.guids);
 	},
 	"rejoined": msg => {
+		g_Players[g_PlayerAssignments[msg.guid].player].rejoining = false;
+		updateViewedPlayerDropdown();
 		addChatMessage({
 			"type": "rejoined",
 			"guid": msg.guid
@@ -761,8 +763,10 @@
 	{
 		g_Players[playerID].guid = guid;
 		g_Players[playerID].name = g_PlayerAssignments[guid].name;
+		g_Players[playerID].rejoining = !!g_Players[playerID].offline;
 		g_Players[playerID].offline = false;
 	}
+	updateViewedPlayerDropdown();
 
 	addChatMessage({
 		"type": "connect",
@@ -777,6 +781,7 @@
 	for (let id in g_Players)
 		if (g_Players[id].guid == guid)
 			g_Players[id].offline = true;
+	updateViewedPlayerDropdown();
 
 	addChatMessage({
 		"type": "disconnect",
Index: binaries/data/mods/public/gui/session/session.js
===================================================================
--- binaries/data/mods/public/gui/session/session.js
+++ binaries/data/mods/public/gui/session/session.js
@@ -79,6 +79,17 @@
 var g_PausingClients = [];
 
 /**
+ * Player selection in observer dropdown style.
+ */
+var g_DropdownPlayerStyle = {
+	"defeated": { "color": "128 128 128" },
+	"offline": { "color": "red" },
+	"rejoining": { "color": "orange" },
+	"offlinedefeated": { "color": "128 0 0" },
+	"online": { "color": "255 255 255" }
+};
+
+/**
  * The playerID selected in the change perspective tool.
  */
 var g_ViewedPlayer = Engine.GetPlayerID();
@@ -439,7 +450,12 @@
 	let viewPlayer = Engine.GetGUIObjectByName("viewPlayer");
 	viewPlayer.list_data = [-1].concat(g_Players.map((player, i) => i));
 	viewPlayer.list = [translate("Observer")].concat(g_Players.map(
-		(player, i) => colorizePlayernameHelper("■", i) + " " + player.name
+		(player, i) => colorizePlayernameHelper("■", i) + " " +
+		setStringTags(player.name, g_DropdownPlayerStyle[g_Players[i].state == "defeated" &&
+			!!g_Players[i].offline ? "offlinedefeated" :
+			!!g_Players[i].rejoining ? "rejoining" :
+			g_Players[i].state == "defeated" ?
+			"defeated" : !!g_Players[i].offline ? "offline" : "online"])
 	));
 }
 
@@ -540,6 +556,7 @@
 	updatePlayerData();
 	updateChatAddressees();
 	updateGameSpeedControl();
+	updateViewedPlayerDropdown();
 
 	if (players.indexOf(g_ViewedPlayer) == -1)
 		return;