With Neo becoming a part of the main cast in Fixing RWBY, Celtic felt the need to have someone else fill her canon role as a partner to Cinder for the Atlas arc. That person is Melanie Malachite. Yknow, one of the twins from Yang's trailer who had a whopping two lines of dialogue and five minutes of screen time. Given the change in the series' direction there's nothing inherently wrong with this, but the execution is what matters
The Malachite twins are unchanged in Yang's trailer and Volume 2. Volume 5 onwards is where the changes happen
Miltia died during the Fall of Beacon, completely off screen. We don't even see the twins during Volume 3 making this come completely out of nowhere. Keep in mind this is a rewrite that had some of the speechless VYTAL tournament members dying on screen
Due to Miltia's death, Melanie has gone completely insane from grief. She constantly hallucinates that Miltia is still around, and simultaneously identifies as both of them at the same time
She takes her sister's claws in addition to her boots to fight with, and wears combinations of both their canon fits. Her semblance is that she can copy the appearance outfit and voice of other people, although she can't change her height
In Volume 5's first episode she tries to kill Roman due to his involvement with the Fall of Beacon being public knowledge, something she's fully justified in because COME ON. Of course, she fails and Roman escapes on a boat because Oz is in his head now locking him into that main character slot. This is her only involvement in Volume 5 by the way
At the tail end of Volume 6 she fights Cinder, doing worse than Neo in canon. Keep in mind that Cinder is also on like five nerfs between her injuries from Raven and being starving, among other things. Cinder's about to kill her but Arslan interrupts it so she can have a crack at Cinder, only to die in less than twenty seconds of narration. Ms Malchite gives Cinder the info she wants on where the main cast are going, and Melanie joins Cinder still wanting to kill Roman. Their final scene is them killing an Atlas officer so Melanie can disguise herself as him
In Volume 7 she helps Cinder with her plans and they meet up with Watts and Tyrian, although since that's more of a Cinder thing, saving that for her dedicated post. Believe me I got some shit to say about her in this rewrite
Toward the end of the volume Melanie meets up with Roman and Neo who are "allying" themselves with Salem's faction. She tries to kill Roman on sight but gets restrained by Cinder. Roman lies to her face that maybe getting all the relics could bring back the dead, giving her a longshot hope at Miltia coming back so she settles down for a bit
Come the volume's climax and she gets into a confrontation with Neo where they're both disguised as the same waitress. They're both unarmed and somehow Melanie loses to Neo despite Melnie's weapons more closely incorporating her bare limbs. So much for "realism" I guess. After Roman and Neo take the lamp from Atlas' vault Melanie tries to kill them. We proceed to get a comedy chase fight where JNR also try to get involved only to get KO'd. Reminder that this is the volume's climax. Melanie pins down Neo and is about to kill her but she uses her semblance to turn into Miltia, causing Melanie to freeze up letting her escape. Seems to be going the direction that Melanie isn't processing her grief, but man
Throughout Volume 7 Melanie makes several flirty remarks with Cinder, seeming to have a thing for her. Considering she's taking over Neo's canon role in the story, and with how poorly the rest of the sapphic women are treated in this rewrite, not a good sign. Wouldn't be surprised if the Curious Cat rips her in half
There's been a decent bit of discourse on how fiction portrays "insane" villains. I'll admit I'm nowhere near educated enough on this topic to make an informed call, but here's my stance. I go with a "three strikes you're out" system with a given type of "problematic" writing. Any more than two and it raises an eyebrow because that's becoming a pattern
FRWBY has three overtly insane villains. Tyrian is obvious and mostly unchanged from canon, Adam is schizophrenic to the point that he argues with his hallucinations, and Melanie's mind is so broken that she hallucinates Miltia at all times and identifies as both of them
I don't mind Melanie's rewrites in isolation. But on top of the insane thing being redundant with Tyrian and to a lesser extent Adam, it's just not a good look. Probably the saddest thing here is that Melanie feels like a pretty superfluous addition to FRWBY. After all, Roman and Neo take the lamp to Salem not her. And the rest of her contributions to the story up to now are very small