Well, the Bad Time Trio's background story is deeply rooted in the lore of Undertale. Sans, he's a character who seems to know more than he lets on. He's from a world full of monsters in the Underground. Chara was one of the first humans to fall into the Underground, and their actions had a great impact on the world. Frisk, on the other hand, is a more recent arrival. The three of them together form this interesting group. Their relationships are shaped by the events in the game, like battles, choices made by the player which are represented through Frisk, and the underlying mysteries that Sans seems to be aware of. It's a story full of mystery, moral choices, and unique character dynamics.
Well, 'Back to the Beginnings: Monster Trio Time Travel' is also a popular one. This fanfiction dives deep into how the Monster Trio's time travel affects the relationships they had in the past. It's not just about fighting enemies but also about mending old bonds. They interact with their past selves in a very interesting way that makes you keep reading.
The Bad Time Trio's story starts with the fall of Chara into the Underground. This event sets in motion a series of interactions between humans and monsters. Then Sans, as a part of the Underground's society, is introduced into this complex web of relationships. Frisk's arrival much later is another key starting point as they begin their journey through the Underground and start to interact with the existing elements related to Sans and the legacy of Chara.
Fred is also very popular. His boldness and eagerness to jump into new situations drive many of the stories forward. Fans enjoy writing about his attempts to solve the problems that come up during their time - travels, like when they end up in the middle of a medieval battle.
Perhaps a storyline where they accidentally bring a character from the past into the present. The character then has to adapt to modern life while the trio tries to figure out how to send them back, which could lead to lots of comical and educational moments.
Adventure is also a big theme. Since they are such dynamic characters, they are often put into exciting adventures, exploring new areas in the Undertale world, fighting off monsters or solving mysteries.
One interesting Golden Trio time travel fanfiction is 'Back to the Beginning'. In this story, Harry, Hermione, and Ron travel back in time to their first year at Hogwarts. It's really cool as they use their future knowledge to change some small things and also prevent some potential disasters. They have to be careful not to disrupt the timeline too much, which adds a lot of suspense to the story.
Hermione would start by studying all the new things she could find. Ron would follow Harry's lead most of the time. Harry would use his instincts to figure out who to trust in this new future.
There's a fanfiction called 'First Year Redo'. In this story, the Golden Trio goes back to their first year and decides to focus on befriending some characters they didn't get to know well before. They also use their knowledge to prevent some small, but annoying things that happened in their first year from occurring again. It's a heartwarming story that shows how much they've grown since their first year at Hogwarts.
Yes, there are some really cool 'Joe x Fred Time Warp Trio fanfics' out there. You can often find them on fanfic websites. Just search for 'Joe x Fred Time Warp Trio' and you'll get a list of relevant stories.