Changelings now transform with the subject's flavortext, height and size, fakedeath now shows as having no functional heart on analyzers

code/modules/surgery/organs/internal/heart/_heart.dm

@@ -127,7 +127,7 @@
 	return beating
 
 /obj/item/organ/heart/get_status_appendix(advanced, add_tooltips)
-	var/bpm = get_heart_rate()
+	var/bpm = get_perceived_heart_rate()
 	. = "[IS_ORGANIC_ORGAN(src) ? "Heart" : "Pulse"] rate: [bpm]" + span_slightly_smaller("bpm")
 	if(bpm <= SLOW_HEARTBEAT_THRESHOLD || bpm >= FAST_HEARTBEAT_THRESHOLD)
 		. = span_alert(.)
@@ -299,6 +299,13 @@
 
 	return max(0, round(final_amount, 1))
 
+/// Gets what a person would see as the heart rate, used for things that fake a non-beating heart like fakedeath
+/obj/item/organ/heart/proc/get_perceived_heart_rate()
+	if(HAS_TRAIT(owner, TRAIT_FAKEDEATH))
+		return 0
+
+	return get_heart_rate()
+
 /// Returns the strength of the heart as a multiplier (0 to 1+)
 /obj/item/organ/heart/proc/get_heart_strength()
 	if(!is_beating() || isnull(owner))
@@ -364,6 +371,8 @@
 	return rand(7, 9) * 10
 
 /mob/living/carbon/human/get_bpm()
+	if(HAS_TRAIT(src, TRAIT_FAKEDEATH))
+		return 0
 	var/obj/item/organ/heart/heart = get_organ_by_type(/obj/item/organ/heart)
 	return heart?.last_bpm || 0
 
@@ -397,6 +406,8 @@
 
 /// Returns the mob's blood pressure range (calculated from average bp with some variance) as a list/tuple of (diastolic pressure, systolic pressure)
 /mob/living/proc/get_bp_range()
+	if(HAS_TRAIT(src, TRAIT_FAKEDEATH))
+		return list(0, 0)
 	var/avg_blood_pressure = get_bp()
 	var/avg_pulse_pressure = get_pp()
 
@@ -412,7 +423,7 @@
 		return ""
 
 	var/bpm_msg = ""
-	var/bpm = get_heart_rate()
+	var/bpm = get_perceived_heart_rate()
 	if(bpm <= 0)
 		bpm_msg = span_boldwarning("You don't feel your heart beating!")
 	else if(bpm < SLOW_HEARTBEAT_THRESHOLD)

maplestation.dme

@@ -6496,6 +6496,7 @@
 #include "maplestation_modules\code\modules\antagonists\advanced_ling\changeling_rebalancing.dm"
 #include "maplestation_modules\code\modules\antagonists\advanced_ling\changeling_stings.dm"
 #include "maplestation_modules\code\modules\antagonists\advanced_ling\neutered_ling.dm"
+#include "maplestation_modules\code\modules\antagonists\changeling\changeling.dm"
 #include "maplestation_modules\code\modules\art\statuettes.dm"
 #include "maplestation_modules\code\modules\cargo\costumes_toys.dm"
 #include "maplestation_modules\code\modules\cargo\goodies.dm"

maplestation_modules/code/modules/antagonists/changeling/changeling.dm

@@ -0,0 +1,34 @@
+/// Handles all of the new modular variables that changelings need for their transformations
+
+/datum/changeling_profile
+	/// Reference to the profile source's flavor_text if it has any
+	var/datum/flavor_text/flavor_text
+	/// the size of the profile source
+	var/size = 1
+	/// The height of the profile source
+	var/height = HUMAN_HEIGHT_MEDIUM
+
+/datum/changeling_profile/copy_profile(datum/changeling_profile/new_profile)
+	. = ..()
+	new_profile.flavor_text = flavor_text
+	new_profile.size = size
+	new_profile.height = height
+
+/datum/antagonist/changeling/create_profile(mob/living/carbon/human/target, protect = 0)
+	var/datum/changeling_profile/new_profile = ..()
+
+	new_profile.flavor_text = target.linked_flavor
+	if(target.dna.features["size"])
+		new_profile.size = target.dna.features["size"]
+	new_profile.height = target.mob_height
+
+	return new_profile
+
+/datum/antagonist/changeling/transform(mob/living/carbon/human/user, datum/changeling_profile/chosen_profile)
+	user.linked_flavor = chosen_profile.flavor_text
+	if(user.dna.features["size"])
+		user.update_transform(RESIZE_DEFAULT_SIZE/user.dna.features["size"])
+	user.update_transform(chosen_profile.size)
+	user.set_mob_height(chosen_profile.height)
+
+	. = ..()

maplestation_modules/code/modules/client/preferences/height.dm

@@ -61,6 +61,8 @@
 	else if(value <= HEIGHT_VERY_SMALL)
 		ADD_TRAIT(target, TRAIT_SMALL, INNATE_TRAIT)
 
+	target.dna.features["size"] = resize_amount
+
 	target.update_transform(resize_amount)
 
 /datum/preference/choiced/mob_size/is_accessible(datum/preferences/preferences)