Humm siren stats are indeed messy. As I bet it mix of shard and harpy morph bonuses that makes it...welll 4 different stats or bosted or nerfed. What you think about those specialy picked for that shak/harpy hybrid (well sirenScore code say siren is mix of those two morphs anyway) +5 Str, +20 Spd, -5 Tou (a lil weaker than shark morph but without his int penatly, alos pently to toughness form hapry part lessened and speed much higher than eiter sharks or hapies? Somehow when I try to think...hapries got already nice speed bonus and sharks are kind also quite fast ones so sirens would be something like sharks swimming into water but since air ius less dense they can attain much higher speed.
As for demons...as I noticed each other morph got similar bonuses to those stats that their respective TF giving in case of demons beoth male and female TF giving two diff boosts (one gender of demons are getting faster while other more inteligent...a lil suprising as I though since they need good "stamina" for fucking anything that walks toughness would be preff stat for their TF to increase of all 4 combat related stats). Other things that could be given them would be something like bonus to tease dmg (a lil weaker version of History perk that giving 15% bonus tease dmg) and as you meantioned bonus to max lust. But value 50 I seen may be a lil too big so what you think about...say +20 to max Lust?
Decent weapon and decent defence too. Well some fights you can't do this at lvl 6 like I think Ceraph with simple smashing atk button at lvl 6 will be highly unwinnable unless you count been hit by her pink fireball as win too. Well it would be winnable if you get probably one of best armors and weapon from endgame but then....why you stayed at lvl 6 went to all endgame zones to get gear to just atk smash Ceraph like she's trash?
Also some other side question: Does Izumi (that Oni gal from mountains) grabbing PC nect to choke him/her is count as she grabbed armor that was also covering neck too or it was already unprotected by armor bare skin?---
+20 to max lust sound like something reasonable as Demon morph are by their nature resiliant to lust effect (heck they spend so much time doing bed stuff I'm surprised they can even get aroused by anything since they basicaly already are in constant arousal).
Improving the tease damage to demon morph would grant the spec a purpose because let's face it curently our hard tease damage strikers are Nagas (Constrict tease is a 2 shot killer) and Kitsunes.
In this way a demon morph could by end game reach 175 max lust (with perk and all) and deal a decent amount of tease damage if using the succubi whip or the tease attack. While i love cat-taurs and speed doublestrike spammer we need to give some love to our lust users as well.
Shark morph would be cool if it even had a stat bonus in the first place wich it for some weird reason does not have. Shark morph currently gives no bonus to any stat...weither it is tiger shark or shark morph it realy gives nothing so yea the only bonus you even get as siren is harpy.
Ill be blunt I think shark deserve more then just a +5 to strength as dragon and satyr already fill this role... how about +10 to strenght -10 to intelligence and +5 to speed? (if -10 to inteligence hurts to much it is always possible to change it to -5). Builds that weaken intelligence aren't actualy present at the time I think we got Cowgirl/Minotaur which weakens speed and Drider wich weakens strenght along with kitsune and fox which also weakens strength but... intelligence? no such thing around yet... not to mention there is no race with +10 strenght currently availlable in the game
In this fashion Siren would end up with +10 strenght +20 speed -10 thoughness -10 inteligence
Again Shark morph aren't Notorious for their fortitude so a shark morph mixed with a harpy having a weakness in both toughness and intelligence still make senses and while this does contradict the fact minerva can use whitefire I'll remind everyone can actualy use spellcasting regardless of race it just happen some are less gifted then others.