In a time-travel historical novel like " The First Chaos in History," would there be multiple characters who time-traveled multiple times?

Before there ever was a boy that ever lived in a cupboard on Four Privet Drive, there was a similar boy in a far worse home that lived on Spinner’s End. We all know the tale of that abused boy who grew up to become a bitter spy. But not all tales end the same for in the many parallel worlds that exist in the universe there are far better endings, and equally as many worse ones. This is a tale of one such condemned universe that for better or for worse chooses to change its own fate at through the sacrifice of the bitter spy. (All rights to the Harry Potter world and characters belong solely to J. K. Rowling. However, I do claim creative fanfiction rights. Please do not post my fanfiction elsewhere without my express permission. This work will also be partially hosted at RoyalRoad, Wattpadd, and Archive.)

Being taken away of all his freedom, Noah was thrown into the jail accused of a murder he hadn't committed. This incident broke his personality permanently, getting out of the jail Noah started living as a shut-in giving up at everything.  Noah read novels as a mean to pass his time, while reading novels an particular novel caught his eyes, it's name was 'the hero of velveric fights the demon lord' 'It's a harem novel......' That was what Noah had thought in the beginning but, it all changed at the end of the novel.  'What the Hell's with this crazy novel!' The protagonist and all his harem members were killed and in the end the demon Lord took over the world.  It was then, after finishing reading the novel, Noah started coughing out blood and succumbed to his lung disease. Opening his eyes Noah found himself in a body of a 8 year old kid of the Melvix family which appeared in that crazy novel. He was known as the garbage of the Melvix family by all the knights and family members but that didn't matter to Noah. What matter is that- 'It's impossible to survive in the novel if you are not strong enough......' ********************************************** The cover used for this novel isn't mine. if you are owner of it and want to remove it please inform me.

(Extended Hiatus) Being a socially inept terminally ill person for most of his life, Simon dies after completing his novel. What is waiting for him? A cliche mess that he had written himself. Watch as he becomes OP through his knowledge and random coincidence. “Why did I make my MC an edgelord?” “Why does this system make me too OP?” “Why am I bored?” “Why did I put harem in my novel?” Read before the MC drops this novel himself!

Adam was a normal teenager, except for his exceptional attractiveness. He was kind, helpful, and enjoyed reading fantasy novels. One day, while out for a walk, he saw a vehicle speeding towards an elderly man. After a moment of internal struggle, Adam decided to help the man from the speeding vehicle, ultimately losing his own life. However he reincarnated in a fantasy world. Upon reincarnation, Adam discovers that he has been reborn as a girl in a novel he had read, but has been captured and sold into slavery. To his surprise, he learns that he is a mixed blood, with half of his blood belonging to a succubus and the other half a mystery. Even more extraordinary is the fact that he possesses not one, but three auras, all of which are mythical and unknown to many in this world, where people are only born with a single aura. Adam is purchased by a beautiful lady and sent to serve her daughter, who just so happens to be one of the main villains in the novel. But why does the villainess seem to know about the future? [This novel contains graphic and explicit content including BDSM, Yuri, GL, and gore. It features futa-female scenes and is not suitable for readers under the age of 18 or those with a sensitive disposition. Read at your own discretion and be prepared for a thrilling and intense experience.] {This novel is also available on ScribbleHub for your reading pleasure.}

Li Jing transmigrated in the xianxia web novel he was reading before his death. Unfortunately for him, he didn’t become the main character. With the help of his knowledge of the web novel and a system gifted by a mysterious god, will he be able to surpass the main character and reach the apex?

Nothing more than an ATG fanfiction.