If you're looking for manga similar to The Princess of Convenient Plot Devices, you might like these titles.
One day, I woke up as Rosalite, the older sister of Asterion in the novel, “Asterion of the Twilight.” I may not be the main character, but it’s not so bad. Rosalite’s little brother, though, is fated to die in the story at 20 and that just seems really unfair after all the drama he’s been through (did I mention his story is a BL?). Now that I’m Rosalite, I decide to save him. But no matter how hard I try, he just keeps dying and every time he dies, I turn back into 16-year-old Rosalite. Ten or so deaths later, I’m more determined than ever to save him. Rich, royal, or sexy foreigner: whoever touches my little brother will die!
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Touch My Little Brother and You're Dead and I'm an Opportunistic Princess both have similar vibes and similar kinds of plots as well as characters.
The fate of a girl in a BL novel is a tragic one. Girls are either vaguely helpful, evil, or add nothing to the plot. So what happens when you turn into the older sister of a BL novel protagonist? The older sister who dies a tragic death at the hands of a madman who’s infatuated with your younger brother? You go with your gut instinct: hide him. Hide your brother from everything, especially men, that could harm him and you. That’s the task that Kyla Vesta is set with in this life, and a task that she’s determined to complete.
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The Opportunistic Princess in Charge of Problem Solving and Let's Hide My Little Brother main characters have similar loving relationship with their brothers.
The daughter of a marquess, Julianna is known as the "perfect lady" by society. However, she has a secret. She's only enjoying acting like the perfect lady! Her true self is hidden under an invisible mask. One day, she is summoned by Prince Edward, the "perfect prince" who is actually a black-hearted schemer! At the royal palace, he gives her a fiendish order. "Become my pawn. You don't have the right to say no!" (Whoa... The prince is so evil!) Julianna reluctantly accepts her duty to act as the prince's pawn, if only to achieve her long-cherished wish, which is...
Izumi Maya, a 33-year-old professional pastry chef who went out to buy some mustard, gets caught in an accident. But when she regains conciousness, she find she has been reincarnated as a 12-year-old princess! On top of that, she also has a husband who was older than her! And a king, no less! Maya realizes that she's in a position where her life might be targeted, and decides to try to get along with her new husband in order to protect herself! In the name of being a pastry chef, I’ll defeat anyone who'd threaten my life and my husband’s stomach at the same time!!
My normal everyday life used to consist of my job, that didn’t depend on me and my hobby, gardening. It’s a modest lifestyle of living alone. Then one day, I open a door to another world - I suddenly realized that there was an open air bath! After I broke off from some naked man and gathered my surroundings, I found out that I am Rosalind, the daughter of a ruined noble. I have absolutely no money, but if I can raise my favorite plants and make some money, I will persist and keep on living in this world. I come from a low social standing so there is the chance I’ll be harassed, but this mysterious man - Alexander - whose origins are unknown, has been taking care of me. Who exactly is he?
Felicia, who suddenly gets back her memories from the previous life, is married off to a distant foreign land by her enthroned elder brother as harassmentー This world is that of an otome game, and my marriage partner, Crown Prince WIlliam, is in love with the saintess from another world. Thus I, the hindrance, will be executed!? To avoid the destruction flag, Felicia decides to live as a commoner while making medicine. However, William whispers breathtakingly alluring words into her ears... What kind of a trap is this!?
Reincarnated as the blond-haired, blue-eyed seventh prince?! Save the kingdom with "office worker" skills!
“You, that’s His Majesty the Emperor, you know?!” “Is that more important than a steamed bun?” Yui Mei has two secrets. First, she retained the memories of her past life. Second, it is highly probable that she is a daughter of the Sai Kingdom’s Emperor. As a certified die-hard fan of Chinese dramas in her past life, she willingly participated in the court lady selection just for the sake of seeing the imperial harem in the flesh.
Aria, a young lady of an unremarkable noble house, was a high school student in her previous life. She was roped into attending a marriage interview with Prince Eugene, who's rumored to be an oddball, and it’s during this meeting that he suddenly makes a ridiculous claim — that he was Oda Nobunaga in his past life!! Well, that explains why the Prince still has yet to find a partner. However, Aria calmly accepts Eugene’s tall tale, which inevitably piques his curiosity… That won’t do! What if he finds out that I, too, have memories from my past life?! Thus begins Aria’s days of being aggressively courted by the world’s most powerful prince who’s capable of unifying entire nations!
Azalea, a duke’s daughter, was once known as the “Wicked Woman Who Ruined the Country” in her previous life and was executed on those false charges. All she wanted in her second life was to live peacefully without being involved in politics or power struggles… but for some reason, she was chosen to be Crown Prince Lotus’ fiancée. Lotus is a problem child that even his parents, the king and queen themselves, have no idea how to handle. Even though Azalea is being thrown into chaos by the eccentric actions of this extreme genius, gradually, she finds that she can’t leave the boy alone…