(I take inspiration from a fanfic called The Spider. I might copy some of the ideas and element's used there)
Crazy man with a unique case of multiple personality disorder desires a new life. Having prepared and rigged the Truck Kun system, he tries to reincarnate because one of his personalities was convinced he would.
Reincarnating but not in the way he thought he would he decides to make the most of his new life.
(Cover art is not mine I just found it on Pinterest)
A man who had a terrible life doubts reality. Some people are super happy with their lives some are depressed. People see reality differently than others. He was depressed he did not know what was reality and why he was so depressing. One day he decided to end his life but before that, he went out to get a final meal. He sees a girl in front of a bus which was about to run her over. He decided to end his life with a final heroic act.
His last words were “at least I did one last heroic act before I died.”
(I'm just doing this now so no one steals my idea I may work on it later in the future.
A scientist who loves the ideas from anime/manga gets reincarnated during his great experiment to prove to everyone he is the greatest genius in history. He tried to be the first to transfer their consciousness into a robot, but he died just as he was about to finish. Was reincarnated in a world identical to his old one but this time he is slightly different. Dying right after becoming the richest man in the world he is sent into a weird space next to a beautiful blue-haired woman and what appeared to be a brown-haired otaku. He finally realizes what world he has been sent to, Follow him on his journey to Conquer the world and maybe kill the demon king along the way?