The Host by Stephenie Meyer?

the host is twilight with aliens. these details do not matter. only focus on taylor lautner's abs. that is all.

It's been a while since I read the book, but from memory I don't think it's majorly detailed how they first got there, but the prologue of the book details the main character getting put into her human host. Basically, the human gets cut at the back of the neck, and the alien gets inserted through the cut. The cut is then healed into a scar.

They aren't a glob of light, they're like glowing insect-type-things.

Hope that helps.

They look like silver centapeads. Their original hosts the Spiders insert them into whatever host they need. The Spiders are very smart and can figure out everything. After the Spiders insert a few Souls, they leave and the inserted souls do the rest.

They get in through an incision in the nape of the neck.

They're corporeal, not light or mist; they look sort of like a silvery centipede with lots of feathery tentacles.

Someone in the book described them as a silver wave/ a lovely feathered ribbon.

The book never describes how the Souls communicate when they are outside a host body. Another species called the Spiders originally learned how to insert Souls into host bodies. Once there were Souls in human bodies they were able to insert other Souls in a surgical procedure. The white suits are the uniform of the Seekers, the police force who are trying to capture fugitive humans. Most Souls wear regular clothing.

The first chapters are confusing, but the book gets much, much better as it goes along. I'm going to summarize them for you to keep you from getting confused. The aliens only take over planets they feel they can improve. They find Earth to be too violent and in danger of having it's environment destroyed by the humans. They take over the human bodies in an effort to experience life as a human, while bringing peace and harmony to Earth. The aliens call themselves "Souls" and in their natural form are 3" long silver bodies shaped like ribbons with hundreds of hairlike limbs called "attachments" which they stretch out to attach themselves to the brain and nerve centers of the host they occupy. The eyes of an occupied human shine silver in the light. Those who hate the Souls call them worms or centipedes, but that's just name calling.

The story begins with a "soul" called Wanderer being inserted into the body of Melanie, a human. The doctor who inserts her is named Fords Deep Waters (the aliens have long names referring to their lives on past planets). We share Wanderer's memories of past planets, like the See-Weeds, just to show how different they were from earth.

Wanderer is trying to get rid of Mel's consciousness and voice inside her head, because she shouldn't have stayed in her body. (A change in font is used to indicate Melanie's thoughts). Wanderer is reporting back to the "Seeker"--a type of detective whose job is to find and capture fugitive humans. Mel yearns to find her lost love and her little brother, who are still human, and keeps throwing memories of them at Wanderer to make her understand the importance of finding them and protecting them from being captured. Wanderer is overwhelmed by the human emotions of Mel's memories, and the conversations with Mel in her head are starting to change her. When The Seeker becomes more and more aggressive, Wanderer and Melanie form an alliance to escape from The Seeker and find Melanie's family.