Well here is what I have in mind, it is a character I submitted for another game but she fits in with the werewolf trope and also sexy lady turned monster trope.
Ares' plan to send the ancient world to chaos had just hit the climax. All mighty Zeus authority was undermined by Ares' machinations. Rebellions sprouted in many factions. Titans were unleashed and challenged the gods. Ancient monsters that were kept prisoner, released. The Ancient world shook with the tremors of war. Just. As. He. Planned. Ares was delighted with the chaos unleashed. But lets look back in time, to those days that were as cruel but simpler. In those days lived an innocent nereid, whose beauty threatened that of the gods. He was pursued by several suitors, and that made the resentful Aphrodite jealous. She sent the evil sorceress Circe to take away her beauty. And the sorceress did so by brewing a dreadful potion with one of Aphrodite's hair. She mixed the potion in Syclla's pool, and when the nereid swam in it, she was transformed in a hideous monster! Her head morphed to that of a terrible reptile, her neck elongated and turned she grew two extra heads full of teeth! Her body turned into a mass of tentacles. In despair and sorrow, she fled from her pond to the deeps of the sea. There she grew large and resentful of the gods. However, Father Poseidon took pity on her and gave her a purpose. She would flood the islands of the humans, and steal land from Zeus for him alongside another monster, Charybdis. Charybdis was a beautiful and powerful Atlantean witch. Scylla was happy to be respected by her father and be of use to the inhabitants of the seas. However Zeus wasn't going to stand idle and let her and Charybdis turn his people into water. He singlehandedly defeated them and turned Charybdis into an even more hideous monster, and chained both in the strait of Sicily.
Scylla waited and waited for Father Poseidon to come to rescue them, but he never came. But Scylla never forgot. She was supposed to devour humans from ships, but instead stole cattle and the occasional sailor. She would pretend to devour them, but instead kidnapped them so they could tell her about the world, both of the surface and of Atlantis, as some of her victims were atlanteans, and after that she released them.
Ages passed in a blink, and more than once Scylla was at the edge of loosing her sanity, as her companion did centuries ago. Had she not kept up her tradition of snatching sailors instead of eating them, she would have succumbed to that same senseless state. Every time the water sink towards Charybdis, she couldn't help to sigh sadly.
Now lets zoom in back to our current time. Ares has led the realm of the gods to utter chaos, and gods and titans do war against each other in an apocalyptic free for all. It was in this battle that Poseido remembered his children trapped by Zeus. Having his elder brother lost face after the battle with Superman, Poseidon thought he could use Scylla and Charybdis for his own machinations once more. When he came to Scylla and freed her from her bound, she lashed out at him and escaped. Charybdis on the other hand was already little more than a beast, and Poseidon tamed her with ease. Little attention did he pay to Scylla, as she swam away into the world of the humans. As she drew away from the realm of the gods, the effect of Circe-s potion grew weaker, and soon Scylla found herself almost in her old self! She was quite delighted by this of course, and promptly forgot about vengeance, justice and the problems that also plagued the world of men. There were enough oddities around by that time that a blue skinned rather attractive nereid didn't really seem all that weird. A couple of years in her newfound life went really fast, and she began to see in full effect the threats that loomed over the world of men. Threats from another reality perhaps, from another world, much like her own. And much like in her world, there were heroes and villains on the human world. Perhaps, perhaps she could do something about this, something to help the people of this world, the innocents like she was, like Charybdis was. No, something needed to be done, something that was both entertaining and good for the people, if such thing exists. The ruthless violence was going to be stopped, and she would look good doing it, even if it meant turning back into the creature that terrorized the hearts of sailors once more, she would do it and still look stunning. She still had to figure out how to get clothing though... Transforming was an issue!
Name: Scylla the Nereid
Height 1,65 mts / 35 mts
Weight 50 kg / roughly 21 tons
Hair: Wateryblue
Feature Nereid
Eyes: Green
Age: Thousands
Complications
Justice... Sorta: Scylla has a very narrow vision of justice, more appropriate of another age, another time. That vision might make her clash with more modern visions of justice.
Charybdis : Charybdis is dear to Scylla, although she is not sane anymore, Scylla hopes to be able to return her to who she was.
Poseidon: Scylla is resentful t her father for betraying her and left her and Charybdis forgotten.
Zeus: Zeus might have lost face but he is still incredibly powerful among the gods. The heresy of escaping from her punishment would not pass inadvertently to him.
Abilities ( 48 pp)
Strength 4 , Stamina 4 , Agility 2 , Dexterity 0 , Fighting 8 , Intellect 0 , Awareness 2 , Precence 4 .
Powers ( 55 pp)
- Scylla the Monster ( Alternate form : Activation: One standard action. -2pp )
· 46 point/s
- Terrorizing roar ( Affliction 10 : Vulnerable & Impaired, Defenseless & Stunned. Extra condition, limited degree. Perception area (hearing). Resisted by Will )
· 20 point/s
- Charybdis´ Legacy ( AP: Transform 5 : Organic into water (3/r). Increased mass 5. Affects 800 lb )
· 1 point/s
- Lashing out ( Elongation 4 : 360 feet in +2 size rank from growth. +4 grab attacks )
· 4 point/s
- Three heads and five Tentacles ( Extra Limbs 5 : Fast grab, Improved Grab, Improved Hold )
· 7 point/s
- Monstrous size ( Growth 8 : +8STR, +8STA, +4 Intimidate, -8 Stealth, -4 active defenses, size rank 0 (30 ft tall). Permanent. )
· 16 point/s
-Nereid biology ( Immunity 2: Age and Drowning )
· 2 point/s
-Eyes of the deep ( Senses 2 Darkvision )
· 2 point/s
-Child of the Sea ( Swimming 5)
· 5 point/s
Advantages ( 16 pp)
Attractive 2 , Diehard 1 , Evasion 2 , Favoured environment (Water) 1 , Improved aim 1 , Inspire 4 , Luck 4 , Power attack 1.
Skills ( 11 pp)
Acrobatics 0 (+ 2 ), Deception 4 (+ 8 ), Athletics 0 (+ 4 ), Expertise () 0 (+ 0 ), Insight 4 (+ 6 ), Treatment 0 (+ 0 ), Persuasion 6 (+ 10 ), Technology 0 (+ 0 ), Close 0 (+ 8 ), Ranged 0 (+ 0 ), Vehicles 0 (+ 2 ), Sleight of Hand 0 (+ 0 ), Perception 4 (+ 6 ), Intimidation 0 (+ 4 ), Investigation 0 (+ 0 ), Stealth 4 (+ 6 ).
Offence
Initiative: 2
Dreadful bite (unnarmed) + 8 Attack for DC: 27
Tentacle entanglement (Grab) + 10 Attack for DC: 20
Terrorizing Roar (Affliction) + Burst area Attack for DC: 20
Charybdis´ Legacy (transform) + 8 Attack for DC: 15