diff --git a/code/ZAS/Atom.dm b/code/ZAS/Atom.dm
index c6eff62e0a3..a6039eeb51e 100644
--- a/code/ZAS/Atom.dm
+++ b/code/ZAS/Atom.dm
@@ -74,6 +74,3 @@
 		result |= M.c_airblock(other)
 		if(result == BLOCKED) return BLOCKED
 	return result
-
-/atom/movable
-	var/atmos_canpass = CANPASS_ALWAYS
diff --git a/code/__HELPERS/icon_smoothing.dm b/code/__HELPERS/icon_smoothing.dm
index 9d001ba9f93..398014f31c3 100644
--- a/code/__HELPERS/icon_smoothing.dm
+++ b/code/__HELPERS/icon_smoothing.dm
@@ -52,11 +52,6 @@
 	/// Icon state of the overlay this object uses to attach to other objects.
 	var/attach_overlay
 
-/atom/movable
-	var/can_be_unanchored = 0
-	var/obj/buckled_to
-	var/can_be_buckled = FALSE
-
 /turf
 	var/list/fixed_underlay
 	/// Determines if we should attempt to generate turf underlays for this type.
diff --git a/code/_onclick/hud/screen_objects.dm b/code/_onclick/hud/screen_objects.dm
index 5e8fe70050f..6f77ed14c4c 100644
--- a/code/_onclick/hud/screen_objects.dm
+++ b/code/_onclick/hud/screen_objects.dm
@@ -28,7 +28,10 @@
 	screen_loc = null
 	if(length(hud?.mymob?.client?.screen))
 		hud.mymob.client.screen -= src
-	hud = null
+	// All register signals MUST be mirrored with Unregister signals included in a Destroy proc, even if other procs also call Unregister Signal.
+	if (hud)
+		UnregisterSignal(hud, COMSIG_QDELETING)
+		hud = null
 	return ..()
 
 /// Screen elements are always on top of the players screen and don't move so yes they are adjacent
@@ -41,6 +44,10 @@
 /atom/movable/screen/proc/handle_hud_destruction()
 	SIGNAL_HANDLER
 
+	// If we were QDEL'ed directly (probably by our owner), then there's no need to Unregister Signal and qdel ourselves twice.
+	if (QDELING(src))
+		return
+
 	UnregisterSignal(hud, COMSIG_QDELETING)
 	qdel(src)
 
diff --git a/code/controllers/subsystems/processing/airflow.dm b/code/controllers/subsystems/processing/airflow.dm
index 9f8c1f82781..12b740a92ea 100644
--- a/code/controllers/subsystems/processing/airflow.dm
+++ b/code/controllers/subsystems/processing/airflow.dm
@@ -92,13 +92,6 @@ PROCESSING_SUBSYSTEM_DEF(airflow)
 
 #undef CLEAR_OBJECT
 
-/atom/movable
-	var/tmp/airflow_xo
-	var/tmp/airflow_yo
-	var/tmp/airflow_od
-	var/tmp/airflow_process_delay
-	var/tmp/airflow_skip_speedcheck
-
 /atom/movable/proc/prepare_airflow(n)
 	if (!airflow_dest || airflow_speed < 0 || last_airflow > world.time - GLOB.vsc.airflow_delay)
 		return FALSE
diff --git a/code/game/atom/_atom.dm b/code/game/atom/_atom.dm
index f859c948744..2ac365e804d 100644
--- a/code/game/atom/_atom.dm
+++ b/code/game/atom/_atom.dm
@@ -74,6 +74,10 @@
 	var/tmp/datum/dynamic_light_source/light
 	///Any light sources that are "inside" of us, for example, if src here was a mob that's carrying a flashlight, that flashlight's light source would be part of this list.
 	var/tmp/list/hybrid_light_sources
+	///The light source, datum. Dont fuck with this directly
+	var/tmp/datum/static_light_source/static_light
+	///Static light sources currently attached to this atom, this includes ones owned by atoms inside this atom
+	var/tmp/list/static_light_sources
 
 	//Values should avoid being close to -16, 16, -48, 48 etc.
 	//Best keep them within 10 units of a multiple of 32, as when the light is closer to a wall, the probability
@@ -152,6 +156,7 @@
 		overlays.Cut()
 
 	QDEL_NULL(light)
+	QDEL_NULL(static_light)
 
 	if(smoothing_flags & SMOOTH_QUEUED)
 		SSicon_smooth.remove_from_queues(src)
diff --git a/code/game/atoms_movable.dm b/code/game/atoms_movable.dm
index ec9f6c8cd35..61a0c5975b7 100644
--- a/code/game/atoms_movable.dm
+++ b/code/game/atoms_movable.dm
@@ -92,6 +92,26 @@
 	var/tmp/airflow_time = 0
 	var/tmp/last_airflow = 0
 
+	var/can_be_unanchored = 0
+	var/obj/buckled_to
+	var/can_be_buckled = FALSE
+
+	/** Used to check wether or not an atom is being handled by SSfalling. */
+	var/tmp/multiz_falling = 0
+
+	var/tmp/airflow_xo
+	var/tmp/airflow_yo
+	var/tmp/airflow_od
+	var/tmp/airflow_process_delay
+	var/tmp/airflow_skip_speedcheck
+
+	/// The mimic (if any) that's *directly* copying us.
+	var/tmp/atom/movable/openspace/mimic/bound_overlay
+	/// If TRUE, this atom is ignored by Z-Mimic.
+	var/z_flags
+
+	var/atmos_canpass = CANPASS_ALWAYS
+
 /atom/movable/Initialize(mapload, ...)
 	. = ..()
 	update_emissive_blocker()
@@ -144,16 +164,12 @@
 			M.pulling = null
 		pulledby = null
 
-	if (bound_overlay)
-		QDEL_NULL(bound_overlay)
-
-	if(em_block)
-		QDEL_NULL(em_block)
-
-	QDEL_NULL(light)
-	QDEL_NULL(static_light)
+	QDEL_NULL(bound_overlay)
+	QDEL_NULL(em_block)
 	airflow_dest = null
 	loc = null
+	buckled_to?.buckled = null
+	buckled_to = null
 	return ..()
 
 /atom/movable/proc/moveToNullspace()
diff --git a/code/modules/clothing/clothing.dm b/code/modules/clothing/clothing.dm
index e55047a1a7b..e66e905753b 100644
--- a/code/modules/clothing/clothing.dm
+++ b/code/modules/clothing/clothing.dm
@@ -528,6 +528,14 @@
 	pickup_sound = 'sound/items/pickup/gloves.ogg'
 	equip_sound = 'sound/items/equip/gloves.ogg'
 
+/obj/item/clothing/gloves/Destroy()
+	QDEL_NULL(cell)
+	if (ring && wearer)
+		wearer.equip_to_slot_if_possible(ring, slot_gloves)
+	ring = null
+	wearer = null
+	return ..()
+
 /obj/item/clothing/gloves/update_clothing_icon()
 	if (ismob(src.loc))
 		var/mob/M = src.loc
@@ -948,6 +956,10 @@
 
 	var/footstep_sound_override
 
+/obj/item/clothing/shoes/Destroy()
+	QDEL_NULL(holding)
+	return ..()
+
 /obj/item/clothing/shoes/proc/draw_knife()
 	set name = "Draw Boot Knife"
 	set desc = "Pull out your boot knife."
diff --git a/code/modules/clothing/spacesuits/rig/modules/modules.dm b/code/modules/clothing/spacesuits/rig/modules/modules.dm
index f635371fc80..460319ab452 100644
--- a/code/modules/clothing/spacesuits/rig/modules/modules.dm
+++ b/code/modules/clothing/spacesuits/rig/modules/modules.dm
@@ -166,9 +166,8 @@
 
 
 /obj/item/rig_module/Destroy()
-	for(var/sm in stat_modules)
-		qdel(sm)
-	stat_modules.Cut()
+	QDEL_LIST(stat_modules)
+	holder?.installed_modules -= src
 	holder = null
 	return ..()
 
diff --git a/code/modules/clothing/spacesuits/rig/rig.dm b/code/modules/clothing/spacesuits/rig/rig.dm
index 4a70736f1ab..818d4cec3ed 100644
--- a/code/modules/clothing/spacesuits/rig/rig.dm
+++ b/code/modules/clothing/spacesuits/rig/rig.dm
@@ -224,13 +224,22 @@
 	piece.icon_supported_species_tags = icon_supported_species_tags
 
 /obj/item/rig/Destroy()
-	for(var/obj/item/piece in list(gloves,boots,helmet,chest))
-		qdel(piece)
 	STOP_PROCESSING(SSmobs, src)
-	qdel(wires)
-	wires = null
-	qdel(spark_system)
-	spark_system = null
+	QDEL_NULL(air_supply)
+	QDEL_NULL(boots)
+	QDEL_NULL(chest)
+	QDEL_NULL(helmet)
+	QDEL_NULL(gloves)
+	QDEL_NULL(cell)
+	selected_module = null
+	visor = null
+	speech = null
+	wearer?.wearing_rig = null
+	wearer = null
+	mob_icon = null
+	QDEL_LIST(installed_modules)
+	QDEL_NULL(wires)
+	QDEL_NULL(spark_system)
 	return ..()
 
 /obj/item/rig/proc/set_vision(var/active)
diff --git a/code/modules/lighting/lighting_static/static_lighting_atom.dm b/code/modules/lighting/lighting_static/static_lighting_atom.dm
index 0f7be52b351..777adee179a 100644
--- a/code/modules/lighting/lighting_static/static_lighting_atom.dm
+++ b/code/modules/lighting/lighting_static/static_lighting_atom.dm
@@ -1,10 +1,3 @@
-
-/atom
-	///The light source, datum. Dont fuck with this directly
-	var/tmp/datum/static_light_source/static_light
-	///Static light sources currently attached to this atom, this includes ones owned by atoms inside this atom
-	var/tmp/list/static_light_sources
-
 ///Pretty simple, just updates static lights on this atom
 /atom/proc/static_update_light()
 	set waitfor = FALSE
diff --git a/code/modules/mob/mob.dm b/code/modules/mob/mob.dm
index 452ccef59c9..0109952c96e 100644
--- a/code/modules/mob/mob.dm
+++ b/code/modules/mob/mob.dm
@@ -54,6 +54,8 @@
 
 	QDEL_NULL(ability_master)
 	QDEL_NULL(zone_sel)
+	if (length(machine?.climbers))
+		machine.climbers -= src
 	machine = null
 
 	client_colors = null
@@ -61,6 +63,7 @@
 	pinned?.Cut()
 	QDEL_LIST(embedded)
 	languages?.Cut()
+	holo?.clear_holo(src)
 	holo = null
 	l_hand = null
 	r_hand = null
@@ -104,11 +107,23 @@
 	QDEL_LIST(click_handlers)
 	vr_mob = null
 	old_mob = null
+	if (lastattacker && lastattacker.lastattacked == src)
+		lastattacker.lastattacked = null
+	if (lastattacked && lastattacked.lastattacker == src)
+		lastattacked.lastattacker = null
 	lastattacker = null
 	lastattacked = null
 	QDEL_NULL(pointing_effect)
-	QDEL_LIST(open_nanouis)
-	QDEL_LIST(tgui_open_uis)
+
+	// Cleanup for all UIs belonging to the client.
+	// For performance reasons we check the length of the lists first since the lists can potentially either be null or empty.
+	// But it's also plausible that they might contain null values, and while their aggressive checking means any valid entry in the list
+	// is guaranteed to be of type /datum/tgui, null entries in the list can potentially exist and will pass the as anything typecast.
+	if (length(tgui_open_uis))
+		for (var/datum/tgui/ui as anything in tgui_open_uis)
+			ui?.close()
+		tgui_open_uis.Cut()
+
 	QDEL_NULL(narsimage)
 	QDEL_NULL(narglow)
 	QDEL_NULL(riftimage)
diff --git a/code/modules/multiz/movement.dm b/code/modules/multiz/movement.dm
index d548bbc22e3..332ae7a5e49 100644
--- a/code/modules/multiz/movement.dm
+++ b/code/modules/multiz/movement.dm
@@ -1,7 +1,3 @@
-/atom/movable
-	/** Used to check wether or not an atom is being handled by SSfalling. */
-	var/tmp/multiz_falling = 0
-
 /**
  * Verb for the mob to move up a z-level if possible.
  */
diff --git a/code/modules/multiz/zmimic/mimic_movable.dm b/code/modules/multiz/zmimic/mimic_movable.dm
index 384e1277159..ab4a387a0dd 100644
--- a/code/modules/multiz/zmimic/mimic_movable.dm
+++ b/code/modules/multiz/zmimic/mimic_movable.dm
@@ -1,9 +1,3 @@
-/atom/movable
-	/// The mimic (if any) that's *directly* copying us.
-	var/tmp/atom/movable/openspace/mimic/bound_overlay
-	/// If TRUE, this atom is ignored by Z-Mimic.
-	var/z_flags
-
 /atom/movable/set_dir(ndir)
 	. = ..()
 	if (. && bound_overlay)
diff --git a/code/modules/organs/internal/brain.dm b/code/modules/organs/internal/brain.dm
index 1b206239f17..d37772ea361 100644
--- a/code/modules/organs/internal/brain.dm
+++ b/code/modules/organs/internal/brain.dm
@@ -124,8 +124,7 @@
 		addtimer(CALLBACK(src, PROC_REF(clear_screen)), 5)
 
 /obj/item/organ/internal/brain/Destroy()
-	if(brainmob)
-		QDEL_NULL(brainmob)
+	QDEL_NULL(brainmob)
 	return ..()
 
 /obj/item/organ/internal/brain/removed(var/mob/living/user)
diff --git a/html/changelogs/hellfirejag-even-more-mob-harddels.yml b/html/changelogs/hellfirejag-even-more-mob-harddels.yml
new file mode 100644
index 00000000000..424f62a94f3
--- /dev/null
+++ b/html/changelogs/hellfirejag-even-more-mob-harddels.yml
@@ -0,0 +1,11 @@
+author: Hellfirejag
+delete-after: True
+changes:
+  - bugfix: "Fixed a hard del caused by mobs not properly cleaning up UI windows."
+  - bugfix: "Fixed hardsuits having several harddels"
+  - bugfix: "Fixed screen objects not always being cleaned up correctly and hard deleting"
+  - bugfix: "Fixed several niche circular references on mobs which caused hard deletes."
+  - bugfix: "Fixed gloves hard deleting if they were worn over a ring or were upgraded to shock gloves"
+  - bugfix: "Fixed static lights not being cleared properly if they were attached to a non-movable atom."
+  - bugfix: "Fixed boots having a hard delete if a knife was stored in them."
+  - bugfix: "Fixed a circular reference between mobs that have attacked each other that was causing hard deletes"