There's not enough information to identify the main characters in 'threads graphic novel'. It could be a single protagonist facing challenges, or a cast of diverse characters each with their own arc. Maybe it's a story about a family, in which case the family members would be the main characters. But until we have more details about this particular graphic novel, it's all speculation.
I'm not sure specifically as there could be many graphic novels with the word 'threads' in the title. It might be about different storylines that are interwoven like threads, perhaps following multiple characters and their intersecting lives.
Since I'm not familiar with the 'threads of time story', it's hard to say exactly. However, it might have characters who are somehow able to manipulate or are deeply affected by these threads of time. They could be scientists or adventurers exploring the mysteries of time, or just regular folks who find themselves in the middle of time - related phenomena.
I'm not sure specifically as I haven't read the exact story. But usually in a story about time, there could be a protagonist who is either trying to understand time or is being affected by the strange properties of time.
There could be a character named Alex. Alex might be a popular student who is good at sports and academics, but also has some insecurities. He could be a leader among his friends and often gets involved in school events.
Maybe it has a young protagonist who is on a journey to find someone. And there could be an older, wiser character who guides the protagonist along the way. The red threads might connect the protagonist to the person they are meant to meet again, and these two main characters would play important roles in the story.
I think the main theme of 'Threads' manhwa is the struggle against societal expectations. The characters are constantly trying to break free from the norms imposed on them and find their own path. There's also a focus on family dynamics and how they influence one's choices.
I'm not sure which specific 2019 graphic novel you're referring to. There are so many different ones out there, each with its own set of main characters.
There's no way to tell without having read the '442 graphic novel'. It could have a protagonist who is a detective trying to solve a mystery related to '442', or it could be a group of friends whose lives are changed because of something to do with '442'. Maybe there's a strong female lead or a young hero in the story.
I'm not sure specifically without reading it, but there could be soldiers. Given the time period of 1941, soldiers would be central characters as they were on the front lines of the war.