How to incorporate a new character effectively in a story?

After finally dying in the arena amidst a dystopian world, I was reborn into a new one. With unfamiliar faces all around me and a new identity as Jay Cadmium, I will become a powerful binder to support my family and protect what I hold dear. ——— Notice: This story is based on the popular webnovel and webcomic The Beginning after the End. Both stories start the SAME and only diverge later on. I'd highly recommend reading The Beginning after the End if you haven't already: https://tbatenovel.com/ ——— Discord: https://discord.gg/PjVE96NTEg

Lee Fei is a normal 30-year-old man who has a good job as a librarian at the National University in China. He is an avid reader and has always read everything, including BL and GL, even though he declares himself 100% straight. He died just like that. There was no truck. There was no car accident. No deadly disease. Lee Fei reincarnated and transmigrated to the world of the book he had read days before he died. Unfortunately, a BL Dark Book. The worst, he transmigrated as an insignificant side character! Lee Fei became Emery Darcy, who is the third child of a powerful duke. Your life should be full of wealth and happiness, right? Unfortunately, Emery Darcy followed the path of an exorcist! Yes, Emery Darcy is an Exorcist Bishop! To make the irony of his situation worse, this side character had a worse fate than the villain. What an injustice! As the knowledge of the plot of this world, Lee Fei intends to return to the home of his rich family and live a good life! So, what if he has divine powers and MANA from nature? He just wants a rich and peaceful life! Ehhhh? Is the MC making a honey trap for me? Is ML no longer a possessive demon, but a tsundere that is following me? Is the fallen archangel a shameless voyeur who spies on me even in the bath? A guardian knight who thinks I'm the reincarnation of the god of nature? Stay away from me, I just want a peaceful life! Does apocalypse come far? No matter, I'm rich enough to protect myself! Let's have a happy and rich life as a good nobleman should be. NOTE: 1. R 18 2. Chapter Auxiliary with the main characters of the harem so far; 3. Harem Romance 4. Follow my Ko-fi for news and weekly calendars: https://ko-fi.com/post/Calendar-1001--1601-L4L27V5L9 and Ko-fi.com/take_the_moon. Thanks for your support in the 2021. Hope we're together in 2022 too.

A professional Hitman reincarnates into a multiverse he thought to be only fiction. But, has his mentality regarding life and death changed during his reincarnation? Have A Wonderful Day!

What if before the 2nd great ninja war the uchiha clan gave birth to a prodigy? Follow Kyokai Uchiha as he strives to become the strongest!

Dying, gaining a few wishes and reincarnating into a world where an Underworld of Vampires pretty much rules the world, watch as Alexander becomes something who makes the Supernatural world know that a single being can become a threat to everything. ( I don't own the cover photo I'm currently using. If the original owner wants me to take it down, then I will. )

Rasa the Fourth Kazekage was a despicable and worthless person despite being a Kage, he made a lot of mistakes and only made the situation of his village worse. But what would happen if someone else lived his life? What would happen if a modern person with future knowledge and great ideas to use his abilities took his body? How would this change affect Naruto's world? He might be able to change history? A person from earth dies in his first life and transmigrates into the body of a young Rasa getting a second chance to live. In his second life he ended up in a world where people dominate several elements by using the chakra and some people even have special eyes. Oh and then there are the so-called Gods. Will he be able to survive and prosper? Will he get to stand on top or will he fall into despair and die? Fanfic SI- MC Disclaimer: The original content of the Naruto characters, manga or anime do not belong to me. All belong to their respective creators and owners. I stated that I do not own the rights to anything other than the FF idea.