Adds a very basic soft restriction system. There's definite room for improvement, but this is good enough for now. Am too hongry for this.

code/__HELPERS/mobs.dm

@@ -47,7 +47,7 @@
 		init_sprite_accessory_subtypes(/datum/sprite_accessory/underwear/socks, GLOB.socks_list)
 	return pick(GLOB.socks_list)
 
-/proc/random_features()
+/proc/random_features(intendedspecies)
 	if(!GLOB.tails_list_human.len)
 		init_sprite_accessory_subtypes(/datum/sprite_accessory/tails/human, GLOB.tails_list_human)
 	if(!GLOB.tails_list_lizard.len)
@@ -105,6 +105,8 @@
 		var/datum/sprite_accessory/mam_tails/instance = GLOB.mam_tails_list[mtpath]
 		if(istype(instance, /datum/sprite_accessory))
 			var/datum/sprite_accessory/S = instance
+			if(intendedspecies && S.recommended_species && !S.recommended_species.Find(intendedspecies))
+				continue
 			if(!S.ckeys_allowed)
 				snowflake_mam_tails_list[S.name] = mtpath
 	var/list/snowflake_markings_list = list()
@@ -112,6 +114,8 @@
 		var/datum/sprite_accessory/mam_body_markings/instance = GLOB.mam_body_markings_list[mmpath]
 		if(istype(instance, /datum/sprite_accessory))
 			var/datum/sprite_accessory/S = instance
+			if(intendedspecies && S.recommended_species && !S.recommended_species.Find(intendedspecies))
+				continue
 			if(!S.ckeys_allowed)
 				snowflake_markings_list[S.name] = mmpath
 	var/list/snowflake_ears_list = list()
@@ -119,6 +123,8 @@
 		var/datum/sprite_accessory/mam_ears/instance = GLOB.mam_ears_list[mepath]
 		if(istype(instance, /datum/sprite_accessory))
 			var/datum/sprite_accessory/S = instance
+			if(intendedspecies && S.recommended_species && !S.recommended_species.Find(intendedspecies))
+				continue
 			if(!S.ckeys_allowed)
 				snowflake_ears_list[S.name] = mepath
 	var/list/snowflake_mam_snouts_list = list()
@@ -126,8 +132,19 @@
 		var/datum/sprite_accessory/mam_snouts/instance = GLOB.mam_snouts_list[mspath]
 		if(istype(instance, /datum/sprite_accessory))
 			var/datum/sprite_accessory/S = instance
+			if(intendedspecies && S.recommended_species && !S.recommended_species.Find(intendedspecies))
+				continue
 			if(!S.ckeys_allowed)
 				snowflake_mam_snouts_list[S.name] = mspath
+	var/list/snowflake_ipc_antenna_list = list()
+	for(var/mspath in GLOB.ipc_antennas_list)
+		var/datum/sprite_accessory/mam_snouts/instance = GLOB.ipc_antennas_list[mspath]
+		if(istype(instance, /datum/sprite_accessory))
+			var/datum/sprite_accessory/S = instance
+			if(intendedspecies && S.recommended_species && !S.recommended_species.Find(intendedspecies))
+				continue
+			if(!S.ckeys_allowed)
+				snowflake_ipc_antenna_list[S.name] = mspath
 	var/color1 = random_short_color()
 	var/color2 = random_short_color()
 	var/color3 = random_short_color()
@@ -153,10 +170,10 @@
 		"insect_fluff"		= "None",
 		"insect_markings"     = pick(GLOB.insect_markings_list),
 		"taur"				= "None",
-		"mam_body_markings" = pick(snowflake_markings_list),
-		"mam_ears" 			= pick(snowflake_ears_list),
-		"mam_snouts"		= pick(snowflake_mam_snouts_list),
-		"mam_tail"			= pick(snowflake_mam_tails_list),
+		"mam_body_markings" = snowflake_markings_list.len ? pick(snowflake_markings_list) : "None",
+		"mam_ears" 			= snowflake_ears_list ? pick(snowflake_ears_list) : "None",
+		"mam_snouts"		= snowflake_mam_snouts_list ? pick(snowflake_mam_snouts_list) : "None",
+		"mam_tail"			= snowflake_mam_tails_list ? pick(snowflake_mam_tails_list) : "None",
 		"mam_tail_animated" = "None",
 		"xenodorsal" 		= "Standard",
 		"xenohead" 			= "Standard",
@@ -204,7 +221,7 @@
 		"womb_cum_rate"		= CUM_RATE,
 		"womb_cum_mult"		= CUM_RATE_MULT,
 		"womb_efficiency"	= CUM_EFFICIENCY,
-		"ipc_screen"		= "Sunburst",
+		"ipc_screen"		= snowflake_ipc_antenna_list ? pick(snowflake_ipc_antenna_list) : "None",
 		"ipc_antenna"		= "None",
 		"flavor_text"		= "",
 		"meat_type"			= "Mammalian"

code/datums/dna.dm

@@ -218,7 +218,7 @@
 	unique_enzymes = generate_unique_enzymes()
 	uni_identity = generate_uni_identity()
 	struc_enzymes = generate_struc_enzymes()
-	features = random_features()
+	features = random_features(species?.id)
 
 
 /datum/dna/stored //subtype used by brain mob's stored_dna

code/modules/antagonists/bloodsucker/powers/veil.dm

@@ -92,7 +92,7 @@
 	H.socks = random_socks(H.gender)
 	//H.eye_color = random_eye_color()
 	REMOVE_TRAIT(H, TRAIT_DISFIGURED, null) //
-	H.dna.features = random_features()
+	H.dna.features = random_features(H.dna.species?.id)
 
 	// Apply Appearance
 	H.update_body() // Outfit and underware, also body.

code/modules/client/preferences.dm

@@ -210,6 +210,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 	var/icon/bgstate = "steel"
 	var/list/bgstate_options = list("000", "midgrey", "FFF", "white", "steel", "techmaint", "dark", "plating", "reinforced")
 
+	var/show_mismatched_markings = FALSE //determines whether or not the markings lists should show markings that don't match the currently selected species. Intentionally left unsaved.
+
 /datum/preferences/New(client/C)
 	parent = C
 
@@ -411,6 +413,14 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 			//Mutant stuff
 			var/mutant_category = 0
 
+			dat += APPEARANCE_CATEGORY_COLUMN
+			dat += "<h3>Show mismatched markings</h3>"
+			dat += "<a style='display:block;width:100px' href='?_src_=prefs;preference=mismatched_markings;task=input'>[show_mismatched_markings ? "Yes" : "No"]</a>"
+			mutant_category++
+			if(mutant_category >= MAX_MUTANT_ROWS) //just in case someone sets the max rows to 1 or something dumb like that
+				dat += "</td>"
+				mutant_category = 0
+
 			if("tail_lizard" in pref_species.default_features)
 				if(!mutant_category)
 					dat += APPEARANCE_CATEGORY_COLUMN
@@ -1618,6 +1628,9 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						else
 							to_chat(user, "<span class='danger'>Invalid color. Your color is not bright enough.</span>")
 
+				if("mismatched_markings")
+					show_mismatched_markings = !show_mismatched_markings
+
 				if("ipc_screen")
 					var/new_ipc_screen
 					new_ipc_screen = input(user, "Choose your character's screen:", "Character Preference") as null|anything in GLOB.ipc_screens_list
@@ -1625,8 +1638,18 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						features["ipc_screen"] = new_ipc_screen
 
 				if("ipc_antenna")
+					var/list/snowflake_antenna_list = list()
+					//Potential todo: turn all of THIS into a define to reduce copypasta.
+					for(var/path in GLOB.ipc_antennas_list)
+						var/datum/sprite_accessory/antenna/instance = GLOB.ipc_antennas_list[path]
+						if(istype(instance, /datum/sprite_accessory))
+							var/datum/sprite_accessory/S = instance
+							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
+								continue
+							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
+								snowflake_antenna_list[S.name] = path
 					var/new_ipc_antenna
-					new_ipc_antenna = input(user, "Choose your character's antenna:", "Character Preference") as null|anything in GLOB.ipc_antennas_list
+					new_ipc_antenna = input(user, "Choose your character's antenna:", "Character Preference") as null|anything in snowflake_antenna_list
 					if(new_ipc_antenna)
 						features["ipc_antenna"] = new_ipc_antenna
 
@@ -1646,6 +1669,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						var/datum/sprite_accessory/tails/human/instance = GLOB.tails_list_human[path]
 						if(istype(instance, /datum/sprite_accessory))
 							var/datum/sprite_accessory/S = instance
+							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
+								continue
 							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
 								snowflake_tails_list[S.name] = path
 					var/new_tail
@@ -1663,6 +1688,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						var/datum/sprite_accessory/mam_tails/instance = GLOB.mam_tails_list[path]
 						if(istype(instance, /datum/sprite_accessory))
 							var/datum/sprite_accessory/S = instance
+							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
+								continue
 							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
 								snowflake_tails_list[S.name] = path
 					var/new_tail
@@ -1686,6 +1713,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						var/datum/sprite_accessory/mam_snouts/instance = GLOB.snouts_list[path]
 						if(istype(instance, /datum/sprite_accessory))
 							var/datum/sprite_accessory/S = instance
+							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
+								continue
 							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
 								snowflake_snouts_list[S.name] = path
 					var/new_snout
@@ -1701,6 +1730,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						var/datum/sprite_accessory/mam_snouts/instance = GLOB.mam_snouts_list[path]
 						if(istype(instance, /datum/sprite_accessory))
 							var/datum/sprite_accessory/S = instance
+							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
+								continue
 							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
 								snowflake_mam_snouts_list[S.name] = path
 					var/new_mam_snouts
@@ -1798,6 +1829,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						var/datum/sprite_accessory/taur/instance = GLOB.taur_list[path]
 						if(istype(instance, /datum/sprite_accessory))
 							var/datum/sprite_accessory/S = instance
+							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
+								continue
 							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
 								snowflake_taur_list[S.name] = path
 					var/new_taur
@@ -1816,6 +1849,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						var/datum/sprite_accessory/ears/instance = GLOB.ears_list[path]
 						if(istype(instance, /datum/sprite_accessory))
 							var/datum/sprite_accessory/S = instance
+							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
+								continue
 							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
 								snowflake_ears_list[S.name] = path
 					var/new_ears
@@ -1829,6 +1864,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						var/datum/sprite_accessory/mam_ears/instance = GLOB.mam_ears_list[path]
 						if(istype(instance, /datum/sprite_accessory))
 							var/datum/sprite_accessory/S = instance
+							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
+								continue
 							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
 								snowflake_ears_list[S.name] = path
 					var/new_ears
@@ -1842,6 +1879,8 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 						var/datum/sprite_accessory/mam_body_markings/instance = GLOB.mam_body_markings_list[path]
 						if(istype(instance, /datum/sprite_accessory))
 							var/datum/sprite_accessory/S = instance
+							if(!show_mismatched_markings && S.recommended_species && !S.recommended_species.Find(pref_species.id))
+								continue
 							if((!S.ckeys_allowed) || (S.ckeys_allowed.Find(user.client.ckey)))
 								snowflake_markings_list[S.name] = path
 					var/new_mam_body_markings

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

@@ -22,7 +22,7 @@
 	if(!pref_species)
 		var/rando_race = pick(GLOB.roundstart_races)
 		pref_species = new rando_race()
-	features = random_features()
+	features = random_features(pref_species?.id)
 	age = rand(AGE_MIN,AGE_MAX)
 
 /datum/preferences/proc/update_preview_icon(equip_job = TRUE)

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

@@ -71,6 +71,9 @@
 
 	//for snowflake/donor specific sprites
 	var/list/ckeys_allowed
+	
+	//For soft-restricting markings to species IDs
+	var/list/recommended_species
 
 /datum/sprite_accessory/underwear
 	icon = 'icons/mob/underwear.dmi'

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

@@ -38,6 +38,7 @@
 	color_src = MATRIXED
 	gender_specific = 0
 	icon = 'modular_citadel/icons/mob/mam_markings.dmi'
+	recommended_species = list("mammal", "xeno", "slimeperson", "podweak")
 
 /datum/sprite_accessory/mam_body_markings/none
 	name = "None"

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

@@ -132,10 +132,12 @@
 /datum/sprite_accessory/antenna
 	icon = 'modular_citadel/icons/mob/ipc_antennas.dmi'
 	color_src = MUTCOLORS2
+	recommended_species = list("ipc")
 
 /datum/sprite_accessory/antenna/none
 	name = "None"
 	icon_state = "None"
+	recommended_species = null
 
 /datum/sprite_accessory/antenna/antennae
 	name = "Angled Antennae"

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

@@ -151,11 +151,12 @@
 /datum/sprite_accessory/mam_snouts
 	color_src = MATRIXED
 	icon = 'modular_citadel/icons/mob/mam_snouts.dmi'
+	recommended_species = list("mammal", "slimeperson", "insect", "podweak")
 
 /datum/sprite_accessory/mam_snouts/none
 	name = "None"
 	icon_state = "none"
-
+	recommended_species = null
 
 /datum/sprite_accessory/mam_snouts/bird
 	name = "Beak"

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

@@ -1,5 +1,6 @@
 //Synth snouts (This is the most important part)
-/datum/sprite_accessory/mam_snouts/synthliz/synthliz_basic
+/datum/sprite_accessory/mam_snouts/synthliz
+	recommended_species = list("synthliz")
 	icon = 'modular_citadel/icons/mob/synthliz_snouts.dmi'
 	color_src = MUTCOLORS
 	name = "Synthetic Lizard - Snout"
@@ -24,7 +25,8 @@
 	icon_state = "synthliz_tertunder"
 
 //Synth body markings
-/datum/sprite_accessory/mam_body_markings/synthliz/synthliz_scutes
+/datum/sprite_accessory/mam_body_markings/synthliz
+	recommended_species = list("synthliz")
 	icon = 'modular_citadel/icons/mob/synthliz_body_markings.dmi'
 	name = "Synthetic Lizard - Plates"
 	icon_state = "synthlizscutes"
@@ -40,26 +42,23 @@
 	icon_state = "synthlizpecslight"
 
 //Synth tails
-/datum/sprite_accessory/mam_tails/synthliz/synthliz_tail
+/datum/sprite_accessory/mam_tails/synthliz
+	recommended_species = list("synthliz")
 	icon = 'modular_citadel/icons/mob/synthliz_tails.dmi'
 	color_src = MUTCOLORS
 	name = "Synthetic Lizard"
 	icon_state = "synthliz"
 
-/datum/sprite_accessory/mam_tails_animated/synthliz/synthliz_tail
+/datum/sprite_accessory/mam_tails_animated/synthliz
+	recommended_species = list("synthliz")
 	icon = 'modular_citadel/icons/mob/synthliz_tails.dmi'
 	color_src = MUTCOLORS
 	name = "Synthetic Lizard"
 	icon_state = "synthliz"
 
 //Synth Antennae
-/datum/sprite_accessory/antenna/synthliz/synthliz_none
-	icon = 'modular_citadel/icons/mob/synthliz_antennas.dmi'
-	color_src = MUTCOLORS
-	name = "None"
-	icon_state = "None"
-
-/datum/sprite_accessory/antenna/synthliz/synthliz_antennae
+/datum/sprite_accessory/antenna/synthliz
+	recommended_species = list("synthliz")
 	icon = 'modular_citadel/icons/mob/synthliz_antennas.dmi'
 	color_src = MUTCOLORS
 	name = "Synthetic Lizard - Antennae"

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

@@ -501,10 +501,12 @@
 /datum/sprite_accessory/mam_tails
 	color_src = MATRIXED
 	icon = 'modular_citadel/icons/mob/mam_tails.dmi'
+	recommended_species = list("mammal", "slimeperson", "podweak", "felinid", "insect")
 
 /datum/sprite_accessory/mam_tails/none
 	name = "None"
 	icon_state = "none"
+	recommended_species = null
 
 /datum/sprite_accessory/mam_tails_animated
 	color_src = MATRIXED