Alice and Adonis, the inseparable siblings. One cold, harsh and quick witted, the other cunning, unpredictable and sadistic, they would have trouble living anywhere but at each other's sides.

Name: Adonis Nightshade
Age: Varies. Usually a young adult or teenager.
Gender: Male
Species: (Super)Human
Sexuality: Adonis is usually straight, though may be otherwise. Usually, Alice will attempt to sabotage relationships she doesn't like, though it's rare he is genuinely interested in someone.
Look: Adonis is an incredibly tall man, with catlike eyes similar to a cloudy jade under his mop of midnight black hair. He has a healthy shade of white skin, his face usually adorned with a cheerful smile. When he is free to express his malicious desires, however, his mouth stretches to unnatural lengths, becoming very reminiscent of a certain semi-omnipotent cat from the literature of Lewis Carrol.
He typically wears what he finds comfortable. His common fare is a turtleneck sweater with a vertical emerald and violet  stripe pattern, worn over a plain white pyjama shirt and black pyjama pants decorated with a series of pancakes, moustaches and poodles. His footwear of choice is a pair of black combat boots, though he may wear cat slippers at times because he got lazy, or wants to appear as such. He, at some point in his life, as sewn a knife holster into every part of his clothing, usually multiple. As for his main clothes, he has a visible black holster on his left sleeve of the sweater, the right side of his shirt and the back of his right leg of the pyjama pants. He also has several better hidden ones with smaller blades, sewn into the inside of the collar of the short, the lower 'lip' of his sweater and one at either side of his thigh in the pants.
Personality: Adonis' personality is difficult to spot at first glance, as he is almost always in character for his role as the 'Lazy big brother.' While like this, he acts smart, but never uses the full extent of his knowledge, is protective of Alice to lengths that he finds ridiculous that people believe it and is often rather lazy, as the name would suggest. Otherwise,p though, Adonis is a sadistic mastermind, usually attempting to think a step ahead of his opponent and force them to submission with a combination of mental warfare, physical warfare and a damn good plan. One of his most dangerous traits is his sheer will, often laughing off extreme pain or sorrow and continuing his tasks. This makes him an unpredictable opponent, as he will likely continue until he is forced to collapse, whether he be fighting, arguing or anything else.
Rigidity: No matter what is done, Adonis will always be a villain. He may tone it down, he may reduce the severity of what he does, but he will always play an antagonistic role. However, he can be conditioned to be nicer, or take it easy on certain people, especially when he is a regular human. What may work on human Adonis may not work on Superhuman Adonis.
Powers: Adonis is capable of moving himself to extreme speeds, even moving as a blur, as well as resisting the damage that doing such would regularly cause a person. Not technically a power, but Adonis has a ridiculous pain tolerance.
Talents: Deception, Stealth, Slight of hand, Knife fighting, Planning, Annoyance, Acting, Sass.
Weakness: Adonis hates water, though it isn't enough to ward him off of a fight. Adonis is the planner of the two siblings, thinking of the long term most of the time. If a plan goes awry, he is the least able of the two to adapt, though he is hardly stupid enough to not be able to to do so. He is also incredibly protective of Alice, to the point where he is willing to place his life on the line to protect her from a conceived threat, which makes her a way to get him to spill his hand. Of course, attacking a little sister in front of their brother is often frowned upon, so be careful with that.
Likes: Adonis has a love-has relationship with cats. He finds them majestic and likes their outlook on life, but he hates the gaudy air they have about them, as if he is worse than them. He enjoys a sip of tea every now and then, finds flowers intriguing and planning. He, of course, loves being the 'bad guy'.
Family: Alice Nightshade, (Sister/Creation, depending.) Parents. (Dead/Inaccessible, depending.)
Other Stuff: Adonis is a pain to play with. He is an arrogant, antagonistic, manipulative bastard with a mind for misery and a tongue of silver. So, I'll give you some tips.
1. Want Adonis to be nice? Force him to promise something. His pride, as stated, is a very important thing to him, so if he promises something he will often follow through.
2. Want to manipulate Adonis? His family are the most successful bargaining chips. Whoever they are, he will probably bend over backwards to help them.

Racial Abilities: Super human (Nightshade Cat)
A superhuman is a human with supernatural abilities, whatever the reason for that is. This specific superhuman is a being able to use the abilities commonly known among cats, then take it even further then before, to a level that is unnatural even among superhumans.
The Nightshade Cat strain of superhuman is able to become incredibly flexible, even the worst trained of them able to bend their most delicate bones into quite frankly contortionist shapes and positions and are able to instantly break and remind their bones at will, though it doesn't stop the pain that performing this action causes.
Additionally, they show a latently increased hearing radius and acuity, limited night vision and vastly enhanced reflexes. When they use any kind of active superpower, they grow a pair of cat ears, a tail and a set of retractable claws from each finger and toe, which disappeared shortly after they stop.

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Name: Alice Nightshade
Age: Varies. Always younger then Adonis, though may be a child, teenager or young adult.
Gender: Female
Species: (Super)Human or Living Doll
Sexuality: Alice is straight, though her brother is often a rather large 'cockblock', if she doesn't do it herself, as she is usually very uninterested in a relationship.
Look: Alice is a short girl, usually standing far below her brother, though she carries herself with an air of someone larger than life, always thinking about what she plans on doing for ages in the future, her catlike eyes shining like emeralds as they survey the details around her, as long as she doesn't get a strand of her long midnight black hair in the way of her sight. She commonly wears a neutral look on her face, her mouth set in a thin line, just short of disapproving.
She values comfort and movement room over fashion, similar to her brother. Her choice of clothing also serves to inspire over confidence in an enemy, making her look underprepared. These clothes are a plain lavender hoodie a single size too big, usually worn with the hoodie left off and her drawstrings as small as possible, over a fluorescent green gym shirt and a pair of violet tracksuit pants, usually protecting her feet with lavender combat boots. She wears a black belt around her pants, not because they are too large but so she can attach three spools of garrotte wire and a combat knife to it, along with a roll of electrical tape.
Personality: Alice, like her brother is a wonderful actor, an art perfected by years of practice and reliance upon it, making her true personality hard to pin down. In public, she dons what Adonis likes to call her 'Smol Annoyance' persona, wherein she becomes disgustingly childish, shy and cheerful, though often drags her 'Lazy big brother' along with her into whatever she does, seeming to be the mastermind of any minor schinanigans they get into. This is an act that often gets passed over by people and their suspicions purely due to the sheer stupidity of it. When able to kick hack her feet and let her true self flow, however, Alice is cold, quiet and often annoyed when approached by people she doesn't know or trust, making her difficult to approach.
Rigidity: Alice will usually show little change, though it mostly depends on how much effort is put into changing her.
Powers: Control wires and wirelike items with impunity, as well as generate small amounts of  a material similar to garrotte wire.
Talents: Assassination, Acting, Stealth, Improvisation, Deception, Videogames, Manually overriding electronics.
Weakness: Alice, despite her relative maturity for her age, is still a child, leading to sometimes immature decisions that are good against the time but may come back to bite her behind later. Also, she is incredibly protective of Adonis, to the point where she is willing to risk life and limb to protect him from death.
Likes: Alice finds flowers beautiful, an example of nature's uninterrupted grace and elegance. She also finds cats adorable, the way they seem to falsely think they are above her even more so. She enjoys a cup of tea to clam her down, especially followed with a cookie, the more almonds the better.
Family: Adonis Nightshade, (Brother/Creator, depending.) Parents (Deceased/Inaccessible, depending.)
Other Stuff: None

Racial Abilities: Nightshade Cat
A superhuman is a human with supernatural abilities, whatever the reason for that is. This specific superhuman is a being able to use the abilities commonly known among cats, then take it even further then before, to a level that is unnatural even among superhumans.
The Nightshade Cat strain of superhuman is able to become incredibly flexible, even the worst trained of them able to bend their most delicate bones into quite frankly contortionist shapes and positions and are able to instantly break and remind their bones at will, though it doesn't stop the pain that performing this action causes.
Additionally, they show a latently increased hearing radius and acuity, limited night vision and vastly enhanced reflexes. When they use any kind of active superpower, they grow a pair of cat ears, a tail and a set of retractable claws from each finger and toe, which disappeared shortly after they stop.