Find That Book

3 different protags (1 for each book). The first book followed a teenage boy in our world who then woke up in a different universe. He woke up to hugging a dragon's claw. From then on, it expanded on the universe, which included the kingdom being ruled by King ____ who was worshipped as a god. This king was not a physical person apparently. He kinda was a god. People who believed in the King had blue eyes. This kingdom was in conflict with another force in a different part of the land, whose people believed in someone else. Their eyes were the color red. The "someone else" used to be a devout follower of the King ____, but ended up betraying the King (Lucifer-style) and was cast out of the kingdom couple hundred years prior to the story. For some reason, there are 7 white fountains, except one of them was burnt and black. Anywaaaay, the story continues on and the protag ended up saving his friends by sticking fireflies onto these bulls' head, causing the enemy to mistake the glowing light for an army that was carrying torches in the night.

I remember that there was a distinct line that was something like, "Everybody is born with a twin." The two worlds, ours and the fantasy world, each had the same person, but a different side to them. When the main protag from the first book arrived in the fantasy universe, the fantasy universe's twin disappeared to our world because...I don't really know. They never meet each other.

The last book featured a war, and the "bad" or red side ended up invading the kingdom. So around the end of the book, everyone died at the hand of the person who betrayed the King, but the protags who died were reborn again into the afterlife. The "everybody has a twin" aspect of the book comes back again and shows that in the afterlife, they were "merged" into the same person.

Some other details:

the first book was published in blue/purple ink, the second book was published in green ink, and the last in red ink

I think the author was male

the people in the book who didn't pick a side had green eyes

I think the duo-protagonist (she never got her own book, but was there with the boy in the first book) was named Gwennifer or Gwenevieve.

I'm sorry that it's missing all the important parts that are needed to find the books. I hope that someone here knows the books I'm talking about. I tried googling, reddit search, amazon. Nada. I can't believe I remember everything else about the series, but not the titles, names, or the name of the kingdom even.