If you're looking for manga similar to Reborn to Master the Blade: From Hero-King to Extraordinary Squire ♀ (Light Novel), you might like these titles.
There was a mage called ‘The Lone Demon King’ at the frontier. He was just a creature that never grew old, but he was loved by the villagers as something of a guardian deity. However, he was destroyed by a magic organization that sees his existence as dangerous. 200 years later, he is reincarnated as the second son of an aristocrat and obtains the strongest magic power. “Let’s pretend to be a human this time.” However, being a human lover, he didn’t particularly think of revenge and has decided to pretend to be human in this life. In his past life, he was the guardian deity of a region, and in this life, he’s a local aristocrat, but he does not know common sense. He doesn’t know how to take it easy. As the second son of an aristocrat, he is loved by his family and friends, and while he is regarded as a master of magic in the magic guild, he becomes an ‘Immortal Mage’ behind the scenes.
17 years ago, a "genius" female knight unknowingly lost her life after being unable to protect a 7-year-old prince who was third in line to succeed the throne and got wrapped up in a war of succession between his two older brothers. That female knight has now been reincarnated as the Countess Flora, and she retains all memories of her past life. She speaks about her past life to no one, and always felt obligated to try to stay away from the royal palace... But the former prince - who has now become king - suddenly comes to her and directly orders her to be his personal guard?! Between being manipulated and being doted over, what will happen in this life between the unmatched swordswoman and His Majesty the King?!
The Adventure of a Lifetime…or Two! When gifted student Kurihara Misato dies right after her high school graduation, she meets God and has a peculiar request: to make her abilities average in the next life. But few things – especially wishes – ever go quite as planned. As she navigates her new life as a ten-year-old girl in a magic-filled world, she realizes God has a unique definition of average!
After thirty-five years of perfectly ordinary life, a run-of-the-mill businessman suddenly drops dead…only to be reborn in another world! Now he must live as Ars Louvent, scion of a minor noble family and wielder of a fabulous skill: Appraisal, the power to perceive the strengths and abilities of others at a glance. He’ll need it, too, because there are plenty of problems to solve in the Louvent family’s territory! Ars only has one choice: recruit the most talented individuals his skill can find, and rise up to new heights in his brand new world!
In order to stay by the side of his liege, Arsmeria, the devoted knight Vance chose to reincarnate with her a thousand years into the future. In his new life he's known as Lloyd, the foster son of Countess Myuria and the wielder of colorless magic. But Lloyd has kept his memories of his past life and of his quest, and when he finds that Arsmeria's reincarnation has been split into six parts, he realizes he's got his work cut out for him!
Jade, the third son of a baron, was kicked out of his home after failing to get a job at the "job change ceremony" when he came of age, but he remembers that the world he is in now is the game world he used to play in his previous life. Jade regains his memories of his previous life, and believes that he can become the strongest adventurer in the world, and uses his knowledge of the game to become an out-of-the-box adventurer.
During the "Divine Blessing Ceremony" of the 15-year-old Elma who came from a lineage of Sword Saints, he had manifested a commonly deemed defective class known as the Heavy Knight. He had been deprived of his position as the next head of the Edvan Household and was then exiled. The Heavy Knight class had an unbalanced status and useless skills, to top it off, it was even said to be a class cowardly and indolent people have. But, Elma knew better—that this world was the world of the game he had used to play before—and that the Heavy Knight class was the strongest class to exist. Elma made full use of the knowledge he had in his previous life and began his efficient walkthrough of the world he was reincarnated into.
I am Owen Pepper, the heir of a Noble family. To begin with, there are two kinds of people in this world. The aristocracy, winners from birth, and the rest of the losers, the cattle. I am a winner, of course. Bwahahaha. Livestock, you can work hard for me today. It is the only thing you lot are good for! I have been reincarnated as a trash aristocrat. My father was a villainous lord. And his son, Owen, has been deeply influenced by his father and has grown up to be a fat, incompetent boy! If this continues, my future is in jeopardy. … But I do not care about that! “I heard that there is magic in this world. If we are going to go to all this trouble, let us try to master magic!” And if you are having fun learning magic, you will soon be able to break the stigma!
Lucifer, the greatest demon lord, who saved the demon race in the war with gods, is reincarnated as a normal adventurer.
In a city of the dead, long since ruined and far from human civilization, lives a single human child. His name is Will, and he's being raised by three undead: the hearty skeletal warrior, Blood; the graceful mummified priestess, Mary; and the crotchety spectral sorcerer, Gus. The three pour love into the boy, and teach him all they know. But one day, Will starts to wonder: "Who am I?" Will must unravel the mysteries of this faraway dead man's land, and unearth the secret pasts of the undead. He must learn the love and mercy of the good gods, and the bigotry and madness of the bad. And when he knows it all, the boy will take his first step on the path to becoming a Paladin.