A couple ideas for your consideration.
Mr. Perfect - NC
"Mr. Wonderful" is something of a bad boy in the world of superheroes. Having given up his civilian identity entirely, the name itself is a clue as he's known for having a bit of a cocky attitude. Also confirmed to be very handsome with peak human strength, peak human agility, peak human stamina, and a superhuman healing speed. Also seems able to heal people by touch in extreme situations. Notorious in superhero circles because while other superheroes tend to show some level of restraint and discretion, Mr. Wonderful happily and proudly uses his status as a superhero to have sex with as many attractive women as he can get to take their clothes off, and he doesn't seem to care about such things as "she's married". Has joked that one of his "heroic duties" is to relieve "sexually unfulfilled women of the burden of involuntary celibacy" and even impregnate women whose "wombs have begged for children for too long, crying out for a hero to fill them". Confirmed to have had hundreds if not thousands of sexual partners, even a string of bastard children, tabloids have nicknamed him Captain Cum Shot for the porn-like attributes his adventures seem to take.
But Mr. Wonderful is hiding some dark secrets. Like how he's lying about his powers. He actually only has one ability, the ability to psychically manipulate biochemistry. And that's just the tip of the surface. Mr. Wonderful has been an active superhero for three years now. Unfortunately, his power and keeping the details of his powers a secret has gone to his head. A year ago he first truly abused his powers when he made a villainess he had just arrested have sex with him. Fortunately for him, he used his biochemistry powers so extensively that she still to this day thinks it was consensual but he knows better. And it was a sexual high unlike anything else he had ever experienced.
A series of rapes has plagued the city over the last year. Women in parks, women in their homes, women in their cars- no attractive woman has proven to be safe. No racial preference, no age preference beyond between the ages of 18 and 40. Known for wearing a dark reflection of Mr. Wonderful's costume, this mysterious rapist calls himself Mr. Perfect. And he's sending letters to Mr. Wonderful to taunt him for not being able to catch him.
He knew he would have to do it again- but he figured it was alright as long as he didn't injure anyone and people could still trust "Mr. Wonderful". So he made his own arch-nemesis, the costume-color inverted "Mr. Perfect". Since then Mr. Perfect has raped about 2 women a week, sending notes to taunt "Mr. Wonderful" about his freedom to cover his tracks. But Mr. Wonderful is hiding that he IS Mr. Perfect, he's developed a new fetish and he has the power to act it out. He doesn't use his powers nearly as extensively as the first time- he finds it even hotter when his victims know he raped them. He just uses his biochemistry abilities to keep them from fighting back too hard and injuring themselves, and to make them enjoy what he does to them. After all, he's not a villain- he's a hero. A hero with an admittedly dark sexual fetish but nobody gets hurt too badly and everyone involved has a few orgasms, so still a hero. Right?
Horny Devil - Undecided
How it happened exactly is something they're still debating about 30 years later. A Planar shift? A universal constant changed? A half-ass attempt at Armageddon? Some sort of combination of all three? Nobody knows, especially not the Supers. While nobody knows the cause, the effect was plain as could be. Suddenly somewhere in the neighborhood of 19 million supernatural creatures came crashing to existence all around the world. Angels, Fae, Ghosts, Monsters, and even Demons. They lost a lot of their powers, they gained a good dose of Free Will, and they found themselves stuck in physical form but there was no question about it. Now, they were real.
After the great Supernatural Cataclysm of 2015, one of the demons in particular changed his name to just Jack. Before the Cataclysm he was an incubus, and over the millienia he allegedly raped thousands of women in their sleep. Post-cataclysm however he now found he actually had free will on par with a human, and when they tried to put him on trial for his actions as a demon they found that they had no proof. His alleged crimes would have to stay alleged.
That however leaves the big question. What next? Now that he actually has free will and actually to make a living among the human race- what's demon got to do to get a little respect around here?