They traveled through time at the same time, but the villainous scientist

I've traveled through time, and it's a time-travel story.
Bad news: the ability to share resources is unavailable.
Good news! Most of the people you travel to are famous figures, and they are all scientists with extraordinary research and development capabilities.
But why are most of them villains?
(Naruto Orochimaru, Ultraman Masaki Keigo, Under One Person Zhuge Qing, Marvel Harry Osborn, Kamen Rider Dai-Shocker, Evangelion, Guyver, Infinite Terror, Dr. Stone, The Three-Body Problem, The Wandering Earth, Gundam...)
In short, this is a story about a group of scientists using cutting-edge technology to change the world, all while simultaneously traveling through time...

Novel keywords: Simultaneous Transmigration, but the Villainous Scientist (no pop-ups), Simultaneous Transmigration, but the Villainous Scientist (full text download), Simultaneous Transmigration, but the Villainous Scientist (latest chapter reading)