There's a bounty for this right? i spent nearly two full days at this

code/modules/mob/dead/dead.dm

@@ -79,7 +79,7 @@ INITIALIZE_IMMEDIATE(/mob/dead)
 		if(1)
 			pick = csa[1]
 		else
-			pick = input(src, "Pick a server to jump to", "Server Hop") as null|anything in csa
+			pick = tgui_input_list(src, "Pick a server to jump to", "Server Hop", csa)
 
 	if(!pick)
 		return

code/modules/mob/dead/new_player/new_player.dm

@@ -251,7 +251,7 @@
 				var/list/days = list()
 				for(var/number in 1 to total_days_in_player_month)
 					days += number
-				var/player_day = input(src, "What day of the month were you born in.") as anything in days
+				var/player_day = tgui_input_list(src, "What day of the month were you born in.", "", days)
 				if(player_day <= current_day)
 					//their birthday has passed
 					age_gate_result = TRUE

code/modules/mob/dead/observer/observer.dm

@@ -475,7 +475,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		var/area/A = V
 		if(!A.hidden)
 			filtered += A
-	var/area/thearea  = input("Area to jump to", "BOOYEA") as null|anything in filtered
+	var/area/thearea  = tgui_input_list(usr, "Area to jump to", "BOOYEA", filtered)
 
 	if(!thearea)
 		return
@@ -557,7 +557,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		var/target = null	   //Chosen target.
 
 		dest += getpois(mobs_only = TRUE) //Fill list, prompt user with list
-		target = input("Please, select a player!", "Jump to Mob", null, null) as null|anything in dest
+		target = tgui_input_list(usr, "Please, select a player!", "Jump to Mob", dest)
 
 		if (!target)//Make sure we actually have a target
 			return
@@ -582,7 +582,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		var/list/views = list()
 		for(var/i in 7 to max_view)
 			views |= i
-		var/new_view = input("Choose your new view", "Modify view range", 0) as null|anything in views
+		var/new_view = tgui_input_list(usr, "Choose your new view", "Modify view range", views)
 		if(new_view)
 			client.view_size.setTo(clamp(new_view, 7, max_view) - 7)
 	else
@@ -697,7 +697,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		if(!(L in GLOB.player_list) && !L.mind)
 			possessible += L
 
-	var/mob/living/target = input("Your new life begins today!", "Possess Mob", null, null) as null|anything in possessible
+	var/mob/living/target = tgui_input_list(usr, "Your new life begins today!", "Possess Mob", possessible)
 
 	if(!target)
 		return 0
@@ -888,7 +888,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 
 	var/eye_name = null
 
-	eye_name = input("Please, select a player!", "Observe", null, null) as null|anything in creatures
+	eye_name = tgui_input_list(usr, "Please, select a player!", "Observe", creatures)
 
 	if (!eye_name)
 		return

code/modules/mob/dead/observer/respawn.dm

@@ -21,7 +21,7 @@
 	if(!valid.len)
 		to_chat(src, "<span class='warning'>No player found that is either a ghost or is in lobby with restrictions active.</span>")
 		return
-	var/ckey = valid[input(src, "Choose a player (only showing logged in players who have restrictions)", "Unrestricted Respawn") as null|anything in valid]
+	var/ckey = valid[tgui_input_list(src, "Choose a player (only showing logged in players who have restrictions)", "Unrestricted Respawn", valid)]
 	var/client/player = GLOB.directory[ckey]
 	if(!player)
 		to_chat(src, "<span class='warning'>Client not found.</span>")
@@ -67,7 +67,7 @@
 	if(!valid.len)
 		to_chat(src, "<span class='warning'>No logged in ghosts found.</span>")
 		return
-	var/mob/dead/observer/O = valid[input(src, "Choose a player (only showing logged in)", "Remove Respawn Timer") as null|anything in valid]
+	var/mob/dead/observer/O = valid[tgui_input_list(src, "Choose a player (only showing logged in)", "Remove Respawn Timer", valid)]
 
 	if(!O.client)
 		to_chat(src, "<span class='warning'>[O] has no client.</span>")