Multiple isekai’d characters

“If you wrote me, then you can give me the throne!”
Yoonsoo is the successful author of a popular fantasy series. Just as she’s about to start work on a new series, Imperial Prince Einzen Kyte, the worst villain she created has kidnapped her into the world of her own story.
• Main character and secondary character. Isekai’d from two different places (but also sort of the same, hard to explain). Important but not main plot point.
• TW: infidelity (sorta)

Mary Albert remembers that this world was an otome game she played in her previous life, and she turns out to be a villain, harassing and interfering with the heroine, and ended up meeting destruction at the end; the so called “villainous girl’s downfall route.” The obvious reaction is to carefully avoid the destruction ending... or not.
• Main character and secondary characters. Important to later arc of the story in which they appear.

Ripley decides to make the best of her reincarnation as an extra in a novel she enjoyed, but it ends up going south. She can remember up to drinking alone in a corner at a party, but she woke up the next day in the male lead’s bed.
• Main character and side character. Briefly mentioned and a short interaction but also extremely important to character development.
• TW: sex w/ one party drunk, kidnapping, attempted murder, attempted rape (not by ML)

Crown Prince Cecil was so brilliant that everything in life was easy to the point of boring him. Until one day, his fiancée Bertia suddenly says, “Prince Cecil, I am a villainess!”
• Love interest and antagonist. Central to plot.

I reincarnated into a novel inside the body of a villainess named Eris. From the moment I realized this, I’ve had only one goal: escape this world.
• MC and side characters. MC’s is plot central. Side is not. One interaction. One other character (mentioned/seen in flashback only) also isekai’d. This one’s important in the info it gives.
• TW: suicide and attempted suicide, attempted rape, child abuse, murder, sorta incest (one-sided), panic attacks, PTSD

I became the secretary of a tyrant in place of my clumsy brother to survive.
But I have so much potential for it. I’m so darn good at my job. Because I served the tyrant so well, everyone must have a happy ending.
Well then, shall I quit being a secretary and live a leisurely life now?
“Do you want to die?”
• Main character and antagonist. Major to plot.
• TW: drugging, murder, attempted rape (not between main couple)

Valerie thought she’d be a geniu in this world by using her knowledge from her past life. But when her magic can’t get past basic and her teacher shares a prophecy of a tiger coming to attack, she opts out. Everything’s fine until she gets engaged to Duke Dwello.
• MC and main supporting character. Isekai’d in different ways. Supporting character’s transmigration is more important to the plot, main character’s is somewhat.
• TW: child abuse, PTSD

Was I reborn? In my previous life, I was a designer who had just graduated, but I then died in an accident. Adelaide, that’s my new name. My new life feels very boring, but then I heard news that there is a girl who can move between dimensions. I decided to go to the capital to meet her; is there something waiting for me there?
• Main character and antagonist. Central to plot. Isekai’d in different ways.

In order to clear the name of 'Emi,' a girl who had reincarnated as Remilia, the villainess of an otome game, the real Remilia who had been watching all along inside, awakens.
• Antagonist and side character. Central to plot.

She has been reborn into the world of an otome game as the villainess, Irene. Using her memories of her former life, she recognizes flags indicating she’s en-route to the bad end, so she makes a plan to conquer the last boss—the evil King Claude—make him her lover, and see if she can open up a new route.
• Main character and antagonist. Central to plot.
• TW: attempted rape (not between couple)