I'm continuing to examine the twins through a mildly different lens than how most of the Twilight fans might view them.
I only own the original character Olly here, nothing else.
Renata thinks that their clan's Political Functions every spring tend to bring out the worst in them, in one way or another.
Though for Aro's sake, she keeps on smiling, trying her very best to create polite small-talk with their visitors gathering in Volterra. And even if a choosing rarely happens, these events were for scouting for new recruits as well.
This time however, Aro and Caius are indeed fixing their attention upon a young newborn vampire, recently adopted by one of their allies. Olly Matheson, he goes by. According to his maker, the poor lad had been drowning in a river when he went out on a hunt. A fishing accident—or something to that effect.
If Renata is to be completely honest with herself, Olly is attractive, even by vampire standards regardless of him being forever sixteen. Her theory is that this has to do with one's mortal age during the Turn. Not unlike the Witch Twins themselves, Olly already possessed the natural beauty of teenage stamina and youth as a human, only making those features that more potent now. He stood tall, lean and distinguished, nearly reaching six feet in height with wild dusty-blonde hair and a crooked smile. His crimson gaze holds a level of charm and excitement for meeting the Volturi Elders in person for the first time.
Olly does make a decent and clean impression well enough, no doubt with the help of his maker who lives like nobility in Norway. Though it's really because of his new developing power that entices Aro most: due to the trauma he's faced, Olly is currently capable of giving his own targets the illusion that they are drowning too evidently, even on dry land and such.
As she watches him conduct a test demonstration on his willing maker just for Aro's benefit, Renata starts to realize how similar his ability is to Jane's. Same concept, same delusional results...it's just fire verses water.
Within the hour, everyone else has returned to mingling and discussing witty topics, while Olly has the nerve to—more or less—seduce Jane. (Granted that he does not fully understand who she is.) And Jane, in all fairness, looks moderately uncertain what to do about Olly.
That's when things do potentially grow worse.
See, the Witch Twins were given an image, a system to rely on. Jane is the frontal feature of that image for a splash of dramatic effect since she's the verbal one. She expresses exactly what she feels. She can become temperamental and hostile more days than not. And that terrifies their captives into obeying her. Her brother, consequently, is the real muscle behind her, being the silent defense, waiting to be used.
Basically the entire Vampire Community knows this.
But there is something else about them everyone does not realize.
...They believe it's Alec who always stabilizes his sister, and that Jane is the insanely jealous one of the two who wants the all the attention for herself, refusing to share. Renata sees this, and she's heard all the rumors, all their stories; but as a fellow Guard, she has lived with them longer and in much closer quarters than those on the outside. So, she does notice certain things that clash with the usual snap-opinions.
Renata beholds the truth.
At first, Alec comes off as the quiet shy type, almost appearing innocent...though, when Jane's temper is a warning trigger for something bad might happen, Alec has an extremely resolute and calculating nature and he will attack without a warning whatsoever. Now Renata wouldn't ever go so far as calling Alec pure evil, or a doomed child of Lucifer, but he still has a dark side that must not go overlooked—and sadly, it usually does. He's certainly not some poor humble soul forever trapped by his sister's wickedness. In reality, there's no way that a boy hated and feared by his whole village his entire life and then sentenced to burn at the stake, would ever walk out of that as a soft-hearted pacifist.
Overall, the twins are way more complex than others may give them credit for.
Similarly, when it specifically comes to Jane, jealously can fill Alec just as much as it would Jane. Maybe, if not more. Jane is Alec's first priority, the one thing he really lives for, the only one he's always tried to protect. And if that feeling is not returned for whatever reason on her end, Alec's natural coolness and composure only deepens further into a form of cold bitterness; and he practically sulks over whatever is theoretically stealing Jane away from him.
Renata observes from afar yet, now wondering if anyone would step in to prevent a fight from starting, let alone notice what's really happening. As far as she knows—this is probably the very first time in a few centuries that a boy around Jane's "age" has actually been this bold to address her in a flirtatious manner. It's definitely not something Jane would be so accustomed to or honestly has that much experience in.
For the single comfortable bond she's ever, ever had since day one is the one she holds with her twin. So, yes, after so many years of being isolated as children and only having the other to hold, of course that possessiveness would become mutual! In fact, the twins are so close that even the other Guards have mockingly whispered things behind their backs—occasionally calling them the Lucrezia and Cesare of the Volturi House—the two siblings whose trust and affection placed in each other runs so deep that it frightens those around them because they can't understand it for themselves.
Another moment or two goes by, and Renata catches Alec studying the pair in return from his current spot next to Santiago several feet away. And as she anticipates, Alec is not that impressed by Olly's forwardness.
Before she knows it there's a stream of black fog slowly coiling its way across the floor soon, aiming straight for the boy.
I quite honestly get the most defensive over Jane than anyone else in the entire series. And I don't really understand why I'm seeing more and more hate for her these days. ...Or is that just me? People are just so quick to point fingers at her and I keep thinking there are far worst characters in literature to detest, people, trust me. I for one, believe she is portrayed in such a close-minded way and I don't picture she'd be as psychotic and shallow as most fan writers make her out be (or even S. Meyer herself, for that matter, since writing in first person POV can always limit the reader's insight to additional characters).
Even with the trauma she's faced, Jane gets basically no slack at all in this franchise! How can vampires like James, Caius, or Aro gain all the fan-love and then Jane is automatically condemned for feeling remotely angry? People call her pure evil because she was resented and abused by an entire village and she want others turn her into a spineless doormat for them to walk over? It would concern me more if she DIDN'T want to fight back against her accusers. I mean, if someone kicks a dog long enough, it's going to bite back. Can you blame it for that? She obviously adores Aro and maintains a loving/trusting relationship with her brother on top of that. Plus, in the last movie, she appeared to be emotionally effected in "Alice's Vision" the moment she watched Alec die, so, that's enough proof to support that she isn't just a crazy-eyed heartless robot child. She is capable of feeling more than simply wishing to kill everyone in her sight.
After all she and her brother have been through, a girl like her is bound to have layers, even if they aren't that obvious.
At least that's my interpretation.