Author Appeal: Both Julia and Sephiroth like many things that Sephirothslave likes, including some books and manga from our world.
Author Phobia: Julia shares her author's fear of needles and doctors. On top of that, Sephirothslave seems to have been uncomfortable with the idea of sexuality and despised boys as a teenager, leading her to project these traits onto her character.
Big Brother Instinct: Arguably. Tseng, towards his foster sister Julia. Although the author describes him as being a loving brother, he is only mildly surprised when she turns up in his class years after she was kidnapped by her biological family and is never implied to have looked for her or worried about her during all this time. This is made worse by the horrible abuse that she suffered at their hands, which could have been prevented if someone as resourceful and intelligent as Tseng would have put his mind into finding her.
Big Brother Worship: Arguably. Julia loves Tseng and regards the time spent in his company as the happiest years of her life. She is overjoyed to have found him again by accident in Midgar, but forgets to visit him after class the very first day they meet again, in spite of his request. They are not shown to be particularly close, especially in Shinra High, and Julia makes no effort to spend time with him.
Big Lipped Alligator Moment: During their brief time as troopers, Julia, Sephiroth, Reno and Rude go out to a bar to get drunk and end up playing spin-the-bottle. Both Julia and Sephiroth end up kissing Reno and Rude, which is particularly jarring because Sephirothslave has many instances of homophobia in her stories, and no less because her main characters are very repressed and almost completely devoid of sexuality. This is the only instance in the entire saga in which they act like normal teenagers.
Bile Fascination: Both stories have a special brand of awful which keeps readers glued to them.
Demoted to Extra: Yuffie and Tifa have a much smaller role in Shinra SOLDIER, as they leave Midgar during the five year time skip and lose touch with Julia and Sephiroth. Yuffie pops up for the Wutai war and Tifa comes back to plan and attend Julia's wedding, but they both disappear afterwards.
Designated Hero: Julia and Sephiroth perform outright atrocities and genocide, yet they are invariably considered the heroes.
Arguably, the entire series - and the Jenova Possession Theory in general - is to defend Sephiroth, stating that it was not his fault that he went crazy and tried to destroy the world. However, it fails this, by painting Sephiroth as psychopathic, mentally unstable, emotionally dependent on Julia, and outright vindictive and cruel. So instead of having a good man, who snapped under the truth, we have a jerk who wasn't responsible for trying to destroy the world, but willingly commits torture, genocide, and other equally abhorrent crimes.
Draco in Leather Pants: Sephiroth of course. Bonus points for being a character who canonically wears leather pants. The entire story is focused on how wonderful a boyfriend he is, even though he's a rather lousy one, and defending his actions in the game.
Tseng also gets this, but to a lesser degree.
Escapist Character: In spite of the misfortunes that befall Julia Nakahamou, she is undeniably an escapist character for her author. Through Julia, Sephirothslave escapes her parents (with whom she admitted to having a tense and complicated relationship as a result of her occult interests) and gets revenge on them, enters into a relationship with Sephiroth, moves in with him in a large mansion and ultimately marries him in a lavish ceremony and gives birth to his child. She also becomes a highly successful, famous and well-paid military commander.
Nightmare Fuel: Julia's cold blooded torture of her female opponents is quite chilling to read. Perhaps even more disturbing is Sephiroth's complete agreement with her heinous acts and their shared perspective that torturing someone and leaving her to bleed to death is nothing more than payback for her breaking Julia's sword.
Nightmare Retardant: Jenova taking over Sephiroth's body and raping Julia and the few other scenes connected to the event are this. Not helped by the fact that Julia gets over the rape in two days and continues as if nothing happened.
Occidental Otaku: Julia claims to have a Japanese nickname (Megami), sometimes utters short phrases in Japanese, has two Japanese weapons (katana and naginata) and is delighted when her older brother decorates her bedroom in an oriental style. This is explained through her being raised by a family from Wutai, so she might have absorbed some aspects of the culture. This starts to have shades of The Farmer and the Viper later in the story, as she slaughters millions of Wutai people without hesitations or any moral dilemmas, and never once thinks that a Wutai family gave her, by her own admission, the most happiest years of her life.
Reality Subtext: Much of what was happening in Sephirothslave's life at the time when she was writing the story can be glimpsed through the lines: her strained relationship with her parents (conservative Catholics who were disturbed by her open interest in the occult and her insistence that the dreams in which she was meeting Sephiroth were real) and her desire to escape them, the crush her friend Ian had on her, her growing interest in martial arts, her frustration with school and boys and ultimately, her chronic depression, isolation and suicide attempt.
Ron the Death Eater: So much. Virtually any hero of the story gets trashed for being opposition to Sephiroth. Primarily we have
Cloud The Idiot: When she actually manages to lock down a personality for Cloud it's a pathetic, wimpy coward who manages to lose his ID card by getting it stuck between his teeth.
Zack The Misogynist: Zack gets turned into a violent, petty, and sexist asshole, who delights in torturing Sephiroth and Julia in anyway he can.
Reno The Prankster: Depending on whether she likes Reno at the moment, Reno is a clumsy, lazy, idiot who is failing every class, and is known for deadly pranks.
Hojo The Sadist: Hojo goes from an ambitious, amoral scientist to a violent psychopath who delights in torturing anybody he can.
Aerith the Friendly Helpful Cheerleader: Special recognition goes to Aerith, who is actually portrayed relatively close to canon. The few scenes she gets she's optimistic, smiling, friendly and helpful. For some reason, everybody hates her, and the audience is supposed to understand why.
Squick: A young Julia (aged around 11-14) is raped by her father as punishment for refusing to have sex with a client, with her mother watching from the treshold. Made much worse by the fact that Julia is an Author Avatar and the evil parents are named after the author's own parents.
Take That: Those familiar with the author's personal life at the time the story was being written (as glimpsed from her journals and comments) can recognize that Sephirothslave inserted her parents in her story (keeping their real names) and portrayed them as horriblly abusive, especially her father, only to have them humiliated and in her father's case, extremely injured by Sephiroth.
Aerith and Cloud are portrayed as universally disliked, a choice fueled by Sephirothslave's extreme dislike of them.
Unintentionally Sympathetic: It's hard not to feel sorry for Cloud, as he is bullied and demeaned in every scene that he is in. Julia shoots a marble at his eye for no other reason than he was asleep before class, Reno snaps at him when he was trying to defuse a tense situation, sneakily cuts off so much of his hair that Cloud is left with a bald spot and leaves the cafeteria crying, and when Cloud is forced to join the military, Reno mocks his name, calls him an idiot and pulls the keycard that Cloud had somehow gotten stuck between his teeth so hard that it leaves a large gap. Nothing Cloud ever did or said invited such callous treatment. Cloud is openly hated by both the characters and the author, who obviously did not intend for him to appear as anything but pathetic.
Despite being nice and friendly, Aerith Gainsborough receives the same treatment from the other characters and the author. She is bullied twice by Reno by having ink splashed all over her, one time at school and the other time during homecoming and has other characters call her ugly and be exasperated with her for no discernable reason at all. In fact, when Rude finds out that she'll be in a play, he says he won't waste money to see it. Their negative attitudes are never explained through anything but the author's own virulent dislike of her. In the one scene she has where she actually does anything and has lines, she is warm and friendly to Sephiroth, helping him pick out the best flowers to give to Julia at the hospital. Despite being nothing but helpful, the moment they leave, Sephiroth berates Yuffie for forcing him to spend time with Aerith and acts like the entire experience was pure torture.
The people of Wutai could fit this trope. They declare war on Shinra but don't actually do anything to harm them, and Shinra sends Sephiroth and Julia, huge fans of the Final Solution. They order the army to decimate every settlement they come across and eventually kill millions by summoning Bahamut to wipe out the capital. From start to finish, Shinra is seen as the agressor, and Wutai does nothing but try to defend itself. Also counts as Plot Hole, since the Wutai capital alone had two million ninjas, while the entire Shinra army had barely a hundred thousand people.
Tseng saying that "suicides are no one's fault but the one who died" when trying to assure Sephiroth that he was not responsible for Laura killing herself. Made worse by the fact that Tseng (a teacher and a character portrayed by the author in a positive light) knows nothing about the circumstances of the girl's death.
Tseng: Alright, I'll let you stay, but do yourself a favor and try to relax. You look terrible. And...know that this wasn't your fault. Suicides are no one's fault but the one who died. (High Chapter 38 - Back to School)
Julia's relationship with Wutai is filled to the brim with this, due to the author forgetting her character's backstory. She was raised in Mideel by Tseng and his family, who are stated to be from Wutai. However, later in the story she calls the people of Wutai heathens and destroys their entire capital, killing millions of soldiers and civilians in a horrible, genocidal slaughter. The thought that she might have extended family living there never crosses her mind, nor does she experience any kind of ethical dilemma. To twist the knife further, when she enters her new mansion shortly after the Wutai massacre, she is delighted to see that Tseng had decorated her bedroom in an oriental theme, with Wutai hanging lanterns and a carved dragon four poster bed... The author really liked Japan at the moment when she wrote the story, and her little bit of wishfulfillment turned into macabre irony because she forgot her own context.
There are some instances in the stories which can be interpreted as homophobia:
Julia reacts to the suggestion that she might be gay as if it were a terrible insult. In fact, one of the biggest changes in the short lived rewrite attempt was her going ballistic when Reno calls her a dyke.
President Shinra: I've watched you two grow up…and you have almost been like children to me. At any rate," he whispered for their ears alone, "you've much more promise then that flamboyant blood son of mine." (Shinra SOLDIER Chapter 76 - A Joyous Reception)
Wangst: Julia will go into full on depression when the story is lacking drama. Often on things that happened years ago.
What an Idiot: Despite both of them earning a lot of money, Sephiroth and Julia chose to live for five years with the insane, abusive professor Hojo instead of moving out and finding a place of their own.
Julia staying with her abusive biological family (two unenhanced, normal humans), even though she was apparently very skilled at combat (having taught basic combat to herself) and possessing several materia such as Bolt and Choco Mog, which she's had since she was six, meaning that she was an experienced caster. There is no reason why someone like her wouldn't just run away and try to make it back to her foster family in Mideel, where Tseng would have helped her hide in case her biological family came back looking for her.
Julia and Sephiroth's double rape under Jenova's influence could have been averted if Julia had been smart enough to not enter Sephiroth's tent and instead send someone like Korokou to check up on him. Rather than do that, she enters his tent against his specific warnings and knowing that Jenova could take control of him and make him hurt her.
The Woobie: Sephirothslave tries to invoke this with both Sephiroth and Julia, but they are so incredibly unsympathetic and the writing is so bad that instead of making readers pity them, it ends up looking like the characters either deserved their punishment or were stupid enough to get themselves into the situation that led to it.