Reincarnated / Soul Switched / Time Travel Younger

Death: Hospital (Incurable Illness?)
Reincarnated to: Otome Game
Role: Villainess
Age: 17??

Plot: Using her former memories Irene realizes she's en-route to death so decides that the best way forward is to force the demon king (hidden route) to marry her.

Thoughts: Irene is so relatable. The Demon Lord is goddamn beautiful! The monsters are adorable! Some great conniving going on to thwart the game's heroine.

Now King Claude, Let us both marry!
..Do you like me?
No? -- AHAHAHA :D

Death: Traffic Accident (aged 17)
Reincarnated to: Otome Game
Role: Villainess
Age: 8
Powers: Earth

Plot: Katarina recovers her past memories after an incident with a rock. She decides to start upskilling herself in order to flee when her bad-end comes a-calling. And in the process attracts the heroine, the capture targets, the rivals... [best comedic harem manga :D ]

Death: Car Accident (Aged 17)
Reincarnated to: Otome Game
Role: Villainess
Age: 15
Powers: Earth

Plot: In an alternate universe, Katarina recovers her past memories after an incident with a muffin. She realizes she's got a year before she meets her destruction end and decides to start making amends for her bullying ways. The rest of the cast find her new attitude between bewildering to highly suspicious.

Thoughts: So much fun :D I love it!

Death: Truck (Aged 15)
Soul Switched (courtesy of the game's god): Otome Game
Role: Villainess
Age: 15
Cheats: Healing Magic, Talks to Animals/Spirits

Plot: In order to keep a looped Otome Game world stable, Kaede's soul is shifted into the villainess. The new Erika decides to avoid anything that could lead to her destruction and, as a backup plan, opens a clothing shop!

Thoughts: Ah I love it! The (evil?) heroine is self-aware too! The ML is supportive! The story rushes though.

Death: Overwork: Drowned (Aged 24)
R: Otome Game
Role: Villainess
Age: 18

Plot: Elizabeth, who ends up banished at the game end, realizes that life as a nun is freaking awesome! She's freed from the obligations of nobility and can do whatever she wants!

Thoughts: It's so cool to have a self-sufficient woman! The ML is too adorable - Elizabeth thinks he's scary (from before) but really he's just completely awkward in interacting with her. Everyone: We better help him.

Death: Car Accident
Soul Switch (?): Novel
Role: Villainess
Age: 18

Plot: Melissa wakes up as the villainess in a novel which has extremely shitty male leads - womanizing crown prince, stalker sniper (her brother), misanthropic asshole werewolf, and a yandere billionaire... and decides to protect the female lead from them.

Thoughts: Much love <3 . Best expressions :D . Ch21 - Bloodthirst moment - I love it :D I seriously adore Melissa - using the novel to fuck up the male leads. So cool :D

Death: Stabbed - aged 26
Reincarnated into: Fantasy world
Role: Princess
Age: Baby
Powers: Power Up

Plot: After Suhee is murdered by a jealous stalker, she reincarnates as a baby into a patriarchal world (women are inferior). Using her cuteness as a weapon she vows to win over her three half-brothers and father (the king).

Thoughts: Fight on! Destroy the patriarchy! Kinda weird the age gap (13 years!) between her and her fiancee (old boyfriend lookalike (or something more? :P))

Death: Fire
Reincarnated: Otome Game
Role: Villainess
Age: 17

Plot: Cecilia, upon recovering her past memories, starts planning to avoid her future bad-end - she and the heroine will fight it out for a 'saint position' (Cecilia will end up dead). Since only women are candidates, the easiest way to avoid everything: become a man! Of course, things go askew..

Thoughts: Cecilia's interpretation of what makes a 'real man' is hilarious! 'Cecil' raising BL-flags :D

Soul Switch: Otome Game
Role: Villainess [Fake Daughter]
Age: 18

Plot: Penelope wakes up in a reverse harem dating sim on hard mode. Initially stuck with following the game's choices, she accesses a hidden event and breaks free! Now she has to survive by reaching a 100% favorability with one of the male leads. [But they're all assholes it seems so good luck]

Thoughts: Tears - so many tears. God her family are such awful, awful people :( The actual game choices at the start were cool though.

Death: Truck (Aged 18)
Reincarnated: Fantasy World
Role: Daughter - Nobility
Age: Baby; 15
Powers: Sewing, Spirit Healing

Plot: Ewey is abused and exploited by her family after she fails to perform 'Divine Protection Embroidery'. She's rescued by Roden (a lord impressed by her seamstress skills), who realizes Ewey's magical worth and that she'll need to be protected. The solution? Marry the former king!~

Thoughts: I love fantasy Cinderella series. The age gap thou...