diff --git a/code/__HELPERS/AStar.dm b/code/__HELPERS/AStar.dm
index 1d165d2102..6be5fc2b16 100644
--- a/code/__HELPERS/AStar.dm
+++ b/code/__HELPERS/AStar.dm
@@ -154,7 +154,7 @@ Actual Adjacent procs :
 /turf/proc/reachableAdjacentTurfs(caller, ID, simulated_only)
 	var/list/L = new()
 	var/turf/T
-	var/static/space_type_cache = typecacheof(list(/turf/open/space))
+	var/static/space_type_cache = typecacheof(/turf/open/space)
 
 	for(var/dir in GLOB.cardinals)
 		T = get_step(src,dir)
diff --git a/code/_globalvars/lists/typecache.dm b/code/_globalvars/lists/typecache.dm
index dfa99b6706..ad4564cf3b 100644
--- a/code/_globalvars/lists/typecache.dm
+++ b/code/_globalvars/lists/typecache.dm
@@ -3,9 +3,9 @@
 
 //Note: typecache can only replace istype if you know for sure the thing is at least a datum.
 
-GLOBAL_LIST_INIT(typecache_mob, typecacheof(list(/mob)))
+GLOBAL_LIST_INIT(typecache_mob, typecacheof(/mob))
 
-GLOBAL_LIST_INIT(typecache_living, typecacheof(list(/mob/living)))
+GLOBAL_LIST_INIT(typecache_living, typecacheof(/mob/living))
 
-GLOBAL_LIST_INIT(typecache_machine_or_structure, typecacheof(list(/obj/machinery))|typecacheof(list(/obj/structure)))
+GLOBAL_LIST_INIT(typecache_machine_or_structure, typecacheof(list(/obj/machinery, /obj/structure)))
 
diff --git a/code/game/machinery/iv_drip.dm b/code/game/machinery/iv_drip.dm
index 23048caf67..2bf3fceb3a 100644
--- a/code/game/machinery/iv_drip.dm
+++ b/code/game/machinery/iv_drip.dm
@@ -10,15 +10,25 @@
 	var/mob/living/carbon/attached = null
 	var/mode = IV_INJECTING
 	var/obj/item/reagent_containers/beaker = null
+<<<<<<< HEAD
 	var/list/drip_containers = list(/obj/item/reagent_containers/blood,
 											/obj/item/reagent_containers/food,
 											/obj/item/reagent_containers/glass)
+=======
+	var/static/list/drip_containers = typecacheof(list(/obj/item/reagent_containers/blood,
+									/obj/item/reagent_containers/food,
+									/obj/item/reagent_containers/glass))
+>>>>>>> 8e434b7... Removes duplicate typecaches (#31883)
 
 /obj/machinery/iv_drip/Initialize()
 	. = ..()
 	update_icon()
+<<<<<<< HEAD
 	drip_containers = typecacheof(drip_containers)
 	
+=======
+
+>>>>>>> 8e434b7... Removes duplicate typecaches (#31883)
 /obj/machinery/iv_drip/Destroy()
 	attached = null
 	QDEL_NULL(beaker)
diff --git a/code/game/turfs/simulated/dirtystation.dm b/code/game/turfs/simulated/dirtystation.dm
index cc3688d064..c411d4b6b1 100644
--- a/code/game/turfs/simulated/dirtystation.dm
+++ b/code/game/turfs/simulated/dirtystation.dm
@@ -72,7 +72,7 @@
 		return
 
 		//Hangars and pods covered in oil.
-	var/static/list/oily_areas = typecacheof(list(/area/quartermaster))
+	var/static/list/oily_areas = typecacheof(/area/quartermaster)
 	if(is_type_in_typecache(A, oily_areas))
 		if(prob(25))
 			new /obj/effect/decal/cleanable/oil(src)
diff --git a/code/modules/hydroponics/grown/towercap.dm b/code/modules/hydroponics/grown/towercap.dm
index f11d6e0772..0d35c7cb6e 100644
--- a/code/modules/hydroponics/grown/towercap.dm
+++ b/code/modules/hydroponics/grown/towercap.dm
@@ -44,15 +44,11 @@
 	attack_verb = list("bashed", "battered", "bludgeoned", "whacked")
 	var/plank_type = /obj/item/stack/sheet/mineral/wood
 	var/plank_name = "wooden planks"
-	var/list/accepted = list(/obj/item/reagent_containers/food/snacks/grown/tobacco,
+	var/static/list/accepted = typecacheof(list(/obj/item/reagent_containers/food/snacks/grown/tobacco,
 	/obj/item/reagent_containers/food/snacks/grown/tea,
 	/obj/item/reagent_containers/food/snacks/grown/ambrosia/vulgaris,
 	/obj/item/reagent_containers/food/snacks/grown/ambrosia/deus,
-	/obj/item/reagent_containers/food/snacks/grown/wheat)
-
-/obj/item/grown/log/Initialize()
-	. = ..()
-	accepted = typecacheof(accepted)
+	/obj/item/reagent_containers/food/snacks/grown/wheat))
 
 /obj/item/grown/log/attackby(obj/item/W, mob/user, params)
 	if(W.sharpness)
@@ -69,7 +65,7 @@
 			to_chat(user, "<span class='notice'>You add the newly-formed [plank_name] to the stack. It now contains [plank.amount] [plank_name].</span>")
 		qdel(src)
 
-	if(is_type_in_typecache(W,accepted))
+	if(CheckAccepted(W))
 		var/obj/item/reagent_containers/food/snacks/grown/leaf = W
 		if(leaf.dry)
 			user.show_message("<span class='notice'>You wrap \the [W] around the log, turning it into a torch!</span>")
@@ -84,6 +80,9 @@
 	else
 		return ..()
 
+/obj/item/grown/log/proc/CheckAccepted(obj/item/I)
+	return is_type_in_typecache(I, accepted)
+
 /obj/item/grown/log/tree
 	seed = null
 	name = "wood log"
@@ -94,10 +93,11 @@
 	name = "steel-cap log"
 	desc = "It's made of metal."
 	icon_state = "steellogs"
-	accepted = list()
 	plank_type = /obj/item/stack/rods
 	plank_name = "rods"
 
+/obj/item/grown/log/steel/CheckAccepted(obj/item/I)
+	return FALSE
 
 /////////BONFIRES//////////
 
diff --git a/code/modules/mining/lavaland/necropolis_chests.dm b/code/modules/mining/lavaland/necropolis_chests.dm
index cd4a9d18dd..4d3dc5db37 100644
--- a/code/modules/mining/lavaland/necropolis_chests.dm
+++ b/code/modules/mining/lavaland/necropolis_chests.dm
@@ -880,11 +880,7 @@
 	var/create_delay = 30
 	var/reset_cooldown = 50
 	var/timer = 0
-	var/banned_turfs
-
-/obj/item/lava_staff/Initialize()
-	. = ..()
-	banned_turfs = typecacheof(list(/turf/open/space/transit, /turf/closed))
+	var/static/list/banned_turfs = typecacheof(list(/turf/open/space/transit, /turf/closed))
 
 /obj/item/lava_staff/afterattack(atom/target, mob/user, proximity_flag, click_parameters)
 	..()
diff --git a/code/modules/mob/living/carbon/human/human_defines.dm b/code/modules/mob/living/carbon/human/human_defines.dm
index 06ee810bc0..97bd22430b 100644
--- a/code/modules/mob/living/carbon/human/human_defines.dm
+++ b/code/modules/mob/living/carbon/human/human_defines.dm
@@ -45,6 +45,9 @@
 	var/datum/personal_crafting/handcrafting
 	can_buckle = TRUE
 	buckle_lying = FALSE
-	can_ride_typecache = list(/mob/living/carbon/human, /mob/living/simple_animal/slime, /mob/living/simple_animal/parrot)
 
 	var/creamed = FALSE //to use with creampie overlays
+<<<<<<< HEAD
+=======
+	var/static/list/can_ride_typecache = typecacheof(list(/mob/living/carbon/human, /mob/living/simple_animal/slime, /mob/living/simple_animal/parrot))
+>>>>>>> 8e434b7... Removes duplicate typecaches (#31883)
diff --git a/code/modules/mob/living/silicon/robot/robot.dm b/code/modules/mob/living/silicon/robot/robot.dm
index 6e899269f3..96467be074 100644
--- a/code/modules/mob/living/silicon/robot/robot.dm
+++ b/code/modules/mob/living/silicon/robot/robot.dm
@@ -95,7 +95,7 @@
 
 	can_buckle = TRUE
 	buckle_lying = FALSE
-	can_ride_typecache = list(/mob/living/carbon/human)
+	var/static/list/can_ride_typecache = typecacheof(/mob/living/carbon/human)
 
 /mob/living/silicon/robot/get_cell()
 	return cell
diff --git a/code/modules/mob/living/simple_animal/hostile/mecha_pilot.dm b/code/modules/mob/living/simple_animal/hostile/mecha_pilot.dm
index 378b5d9b8e..f9868771ac 100644
--- a/code/modules/mob/living/simple_animal/hostile/mecha_pilot.dm
+++ b/code/modules/mob/living/simple_animal/hostile/mecha_pilot.dm
@@ -41,7 +41,7 @@
 
 /mob/living/simple_animal/hostile/syndicate/mecha_pilot/no_mech/Initialize()
 	. = ..()
-	wanted_objects = typecacheof(/obj/mecha/combat, ignore_root_path=TRUE)
+	wanted_objects = typecacheof(/obj/mecha/combat, TRUE)
 
 /mob/living/simple_animal/hostile/syndicate/mecha_pilot/nanotrasen //nanotrasen are syndies! no it's just a weird path.
 	name = "Nanotrasen Mecha Pilot"
@@ -101,7 +101,7 @@
 	targets_from = src
 
 	//Find a new mecha
-	wanted_objects = typecacheof(/obj/mecha/combat, ignore_root_path=TRUE)
+	wanted_objects = typecacheof(/obj/mecha/combat, TRUE)
 	var/search_aggressiveness = 2
 	for(var/obj/mecha/combat/C in range(vision_range,src))
 		if(is_valid_mecha(C))
diff --git a/code/modules/mob/living/simple_animal/hostile/megafauna/colossus.dm b/code/modules/mob/living/simple_animal/hostile/megafauna/colossus.dm
index 4962851a71..7cf68dc401 100644
--- a/code/modules/mob/living/simple_animal/hostile/megafauna/colossus.dm
+++ b/code/modules/mob/living/simple_animal/hostile/megafauna/colossus.dm
@@ -663,12 +663,7 @@ Difficulty: Very Hard
 	activation_method = ACTIVATE_TOUCH
 	cooldown_add = 50
 	activation_sound = 'sound/magic/timeparadox2.ogg'
-	var/list/banned_items_typecache = list(/obj/item/storage, /obj/item/implant, /obj/item/implanter, /obj/item/disk/nuclear, /obj/item/projectile, /obj/item/spellbook)
-
-/obj/machinery/anomalous_crystal/refresher/Initialize()
-	. = ..()
-	banned_items_typecache = typecacheof(banned_items_typecache)
-
+	var/static/list/banned_items_typecache = typecacheof(list(/obj/item/storage, /obj/item/implant, /obj/item/implanter, /obj/item/disk/nuclear, /obj/item/projectile, /obj/item/spellbook))
 
 /obj/machinery/anomalous_crystal/refresher/ActivationReaction(mob/user, method)
 	if(..())
diff --git a/code/modules/mob/living/simple_animal/hostile/megafauna/swarmer.dm b/code/modules/mob/living/simple_animal/hostile/megafauna/swarmer.dm
index 10906114dd..4c803d6c00 100644
--- a/code/modules/mob/living/simple_animal/hostile/megafauna/swarmer.dm
+++ b/code/modules/mob/living/simple_animal/hostile/megafauna/swarmer.dm
@@ -172,16 +172,9 @@ GLOBAL_LIST_INIT(AISwarmerCapsByType, list(/mob/living/simple_animal/hostile/swa
 	search_objects = 1
 	attack_all_objects = TRUE //attempt to nibble everything
 	lose_patience_timeout = 150
-	var/static/list/sharedWanted = list(/turf/closed/mineral, /turf/closed/wall) //eat rocks and walls
+	var/static/list/sharedWanted = typecacheof(list(/turf/closed/mineral, /turf/closed/wall)) //eat rocks and walls
 	var/static/list/sharedIgnore = list()
 
-
-/mob/living/simple_animal/hostile/swarmer/ai/resource/Initialize()
-	. = ..()
-	sharedWanted = typecacheof(sharedWanted)
-	sharedIgnore = typecacheof(sharedIgnore)
-
-
 //This handles viable things to eat/attack
 //Place specific cases of AI derpiness here
 //Most can be left to the automatic Gain/LosePatience() system
@@ -239,18 +232,15 @@ GLOBAL_LIST_INIT(AISwarmerCapsByType, list(/mob/living/simple_animal/hostile/swa
 
 //So swarmers can learn what is and isn't food
 /mob/living/simple_animal/hostile/swarmer/ai/resource/proc/add_type_to_wanted(typepath)
-	LAZYINITLIST(sharedWanted)
 	if(!sharedWanted[typepath])// this and += is faster than |=
 		sharedWanted += typecacheof(typepath)
 
 
 /mob/living/simple_animal/hostile/swarmer/ai/resource/proc/add_type_to_ignore(typepath)
-	LAZYINITLIST(sharedIgnore)
 	if(!sharedIgnore[typepath])
 		sharedIgnore += typecacheof(typepath)
 
 
-
 //RANGED SWARMER
 /mob/living/simple_animal/hostile/swarmer/ai/ranged_combat
 	icon_state = "swarmer_ranged"
diff --git a/code/modules/mob/mob.dm b/code/modules/mob/mob.dm
index 0083e89b81..c1279ac089 100644
--- a/code/modules/mob/mob.dm
+++ b/code/modules/mob/mob.dm
@@ -26,8 +26,11 @@
 	else
 		GLOB.living_mob_list += src
 	prepare_huds()
+<<<<<<< HEAD
 	can_ride_typecache = typecacheof(can_ride_typecache)
 	hook_vr("mob_new",list(src))
+=======
+>>>>>>> 8e434b7... Removes duplicate typecaches (#31883)
 	for(var/v in GLOB.active_alternate_appearances)
 		if(!v)
 			continue
diff --git a/code/modules/mob/mob_defines.dm b/code/modules/mob/mob_defines.dm
index 6becdb3ddd..b8ddb74496 100644
--- a/code/modules/mob/mob_defines.dm
+++ b/code/modules/mob/mob_defines.dm
@@ -140,7 +140,6 @@
 	var/list/observers = null	//The list of people observing this mob.
 
 	var/list/progressbars = null	//for stacking do_after bars
-	var/list/can_ride_typecache = list()
 
 	var/list/mousemove_intercept_objects
 
diff --git a/code/modules/procedural_mapping/mapGeneratorModules/helpers.dm b/code/modules/procedural_mapping/mapGeneratorModules/helpers.dm
index 6fdcccd43f..4f761412f7 100644
--- a/code/modules/procedural_mapping/mapGeneratorModules/helpers.dm
+++ b/code/modules/procedural_mapping/mapGeneratorModules/helpers.dm
@@ -32,7 +32,7 @@
 
 /datum/mapGeneratorModule/bottomLayer/massdelete/no_delete_mobs/New()
 	..()
-	ignore_typecache = typecacheof(list(/mob))
+	ignore_typecache = GLOB.typecache_mob
 
 /datum/mapGeneratorModule/bottomLayer/massdelete/leave_turfs
 	deleteturfs = FALSE
@@ -42,7 +42,7 @@
 
 /datum/mapGeneratorModule/bottomLayer/massdelete/regeneration_delete/New()
 	..()
-	ignore_typecache = typecacheof(list(/mob))
+	ignore_typecache = GLOB.typecache_mob
 
 //Only places atoms/turfs on area borders
 /datum/mapGeneratorModule/border
diff --git a/code/modules/surgery/organs/tongue.dm b/code/modules/surgery/organs/tongue.dm
index 5e67e73a8a..449e88dc58 100644
--- a/code/modules/surgery/organs/tongue.dm
+++ b/code/modules/surgery/organs/tongue.dm
@@ -8,10 +8,7 @@
 	var/list/languages_possible
 	var/say_mod = null
 	var/taste_sensitivity = 15 // lower is more sensitive.
-
-/obj/item/organ/tongue/Initialize(mapload)
-	. = ..()
-	languages_possible = typecacheof(list(
+	var/static/list/languages_possible_base = typecacheof(list(
 		/datum/language/common,
 		/datum/language/draconic,
 		/datum/language/codespeak,
@@ -21,6 +18,10 @@
 		/datum/language/ratvar
 	))
 
+/obj/item/organ/tongue/Initialize(mapload)
+	. = ..()
+	languages_possible = languages_possible_base
+
 /obj/item/organ/tongue/get_spans()
 	return list()
 
@@ -124,16 +125,17 @@
 	icon_state = "tonguexeno"
 	say_mod = "hisses"
 	taste_sensitivity = 10 // LIZARDS ARE ALIENS CONFIRMED
-
-/obj/item/organ/tongue/alien/Initialize(mapload)
-	. = ..()
-	languages_possible = typecacheof(list(
+	var/static/list/languages_possible_alien = typecacheof(list(
 		/datum/language/xenocommon,
 		/datum/language/common,
 		/datum/language/draconic,
 		/datum/language/ratvar,
 		/datum/language/monkey))
 
+/obj/item/organ/tongue/alien/Initialize(mapload)
+	. = ..()
+	languages_possible = languages_possible_alien
+
 /obj/item/organ/tongue/alien/TongueSpeech(var/message)
 	playsound(owner, "hiss", 25, 1, 1)
 	return message