diff --git a/code/datums/components/_component.dm b/code/datums/components/_component.dm
index de0ae7226ea..9000cf3a982 100644
--- a/code/datums/components/_component.dm
+++ b/code/datums/components/_component.dm
@@ -99,7 +99,7 @@
 				for(var/J in 1 to components_of_type.len)
 					var/datum/component/C = components_of_type[J]
 					if(C.type != our_type) //but not over other exact matches
-						components_of_type.Insert(J, I)
+						components_of_type.Insert(J, src)
 						inserted = TRUE
 						break
 				if(!inserted)
diff --git a/code/datums/datum.dm b/code/datums/datum.dm
index d6916cc9d5b..b1fea17c964 100644
--- a/code/datums/datum.dm
+++ b/code/datums/datum.dm
@@ -106,7 +106,7 @@
 		var/list/timers = _active_timers
 		_active_timers = null
 		for(var/datum/timedevent/timer as anything in timers)
-			if (timer.spent && !(timer.flags & TIMER_DELETE_ME))
+			if (!timer || (timer.spent && !(timer.flags & TIMER_DELETE_ME)))
 				continue
 			qdel(timer)
 
@@ -126,6 +126,8 @@
 			var/component_or_list = dc[component_key]
 			if(islist(component_or_list))
 				for(var/datum/component/component as anything in component_or_list)
+					if (!component)
+						continue
 					qdel(component, FALSE)
 			else
 				var/datum/component/C = component_or_list
diff --git a/code/datums/langchat/langchat.dm b/code/datums/langchat/langchat.dm
index 45ddd09b561..5f7d91ff629 100644
--- a/code/datums/langchat/langchat.dm
+++ b/code/datums/langchat/langchat.dm
@@ -46,9 +46,13 @@
 /// Drops all active bubbles for this atom.
 /atom/proc/langchat_drop_images()
 	for(var/datum/langchat_bubble/entry as anything in langchat_images)
+		if (!entry || !entry.bubble)
+			continue
+
 		for(var/mob/listener as anything in entry.listeners)
-			if(listener.client)
-				listener.client.images -= entry.bubble
+			if (!listener || !listener.client)
+				continue
+			listener.client.images -= entry.bubble
 	langchat_images = null
 
 /atom/proc/get_maptext_x_offset(image/maptext_image)
diff --git a/code/game/atom/_atom.dm b/code/game/atom/_atom.dm
index 2ac365e804d..77c21d85c0b 100644
--- a/code/game/atom/_atom.dm
+++ b/code/game/atom/_atom.dm
@@ -155,6 +155,9 @@
 	if(length(overlays))
 		overlays.Cut()
 
+	if (length(underlays))
+		underlays.Cut()
+
 	QDEL_NULL(light)
 	QDEL_NULL(static_light)
 
diff --git a/code/game/atoms_movable.dm b/code/game/atoms_movable.dm
index 61a0c5975b7..6ac8ac31238 100644
--- a/code/game/atoms_movable.dm
+++ b/code/game/atoms_movable.dm
@@ -124,10 +124,9 @@
 		AddComponent(/datum/component/overlay_lighting, is_directional = TRUE)
 
 /atom/movable/Destroy(force)
-	if(orbiting)
-		orbiting.end_orbit(src)
-
+	orbiting?.end_orbit(src)
 	QDEL_NULL(emissive_overlay)
+	particles = null
 
 	if(move_packet)
 		if(!QDELETED(move_packet))
@@ -687,6 +686,8 @@
 	SSspatial_grid.remove_grid_membership(src, our_turf, SPATIAL_GRID_CONTENTS_TYPE_HEARING)
 
 	for(var/atom/movable/location as anything in get_nested_locs(src) + src)
+		if (!location)
+			continue
 		var/list/recursive_contents = location.important_recursive_contents // blue hedgehog velocity
 		recursive_contents[RECURSIVE_CONTENTS_HEARING_SENSITIVE] -= src
 		if(!length(recursive_contents[RECURSIVE_CONTENTS_HEARING_SENSITIVE]))
diff --git a/code/modules/mob/living/carbon/diona_base.dm b/code/modules/mob/living/carbon/diona_base.dm
index 4e28ee2c62c..3a5dd9014da 100644
--- a/code/modules/mob/living/carbon/diona_base.dm
+++ b/code/modules/mob/living/carbon/diona_base.dm
@@ -636,7 +636,8 @@ Most of these values are calculated from information configured at authortime in
 	last_location = null
 	regen_limb = null
 	regen_extra = null
-	. = ..()
+	nym = null
+	return ..()
 
 /datum/dionastats/proc/do_blood_suck(var/mob/living/carbon/user, var/mob/living/carbon/human/H)
 	user.visible_message(SPAN_DANGER("[user] is trying to bite [H.name]."), SPAN_DANGER("You start biting \the [H], you both must stay still!"))
diff --git a/code/modules/mob/living/carbon/human/human.dm b/code/modules/mob/living/carbon/human/human.dm
index 363485acba8..79eff55dfbe 100644
--- a/code/modules/mob/living/carbon/human/human.dm
+++ b/code/modules/mob/living/carbon/human/human.dm
@@ -101,7 +101,6 @@
 	//Srom (Shared Dreaming)
 	srom_pulled_by = null
 	srom_pulling = null
-	bg = null //Just to be sure.
 
 	GLOB.human_mob_list -= src
 	GLOB.intent_listener -= src
diff --git a/html/changelogs/hellfirejag-final-atoms-audit.yml b/html/changelogs/hellfirejag-final-atoms-audit.yml
new file mode 100644
index 00000000000..e630ef3430b
--- /dev/null
+++ b/html/changelogs/hellfirejag-final-atoms-audit.yml
@@ -0,0 +1,4 @@
+author: Hellfirejag
+delete-after: True
+changes:
+  - bugfix: "Fixed numerous hard dels related to byond built-in refs not being cleared."