Some characters that would be interesting to add to the Thor Ragnarok time - travel fanfiction are the Valkyries from an earlier era. They could provide valuable fighting skills and knowledge of Asgard's past. Additionally, the Grandmaster from a different time - space continuum could be added. He could be involved in some sort of time - travel experiment that Thor gets caught up in. And what about the Celestials? They are powerful beings and their presence in the time - travel story could introduce a whole new level of cosmic drama.
One character that could be added is the Enchantress. She could use her magic to either help or hinder Thor's time - travel attempts. Another could be Beta Ray Bill. He could team up with Thor in the different time periods they visit during their time - travel adventures. And perhaps the Warriors Three could be brought back through time - travel shenanigans, even if they died in the original Ragnarok storyline.
One idea could be Thor traveling back in time to prevent Ragnarok from happening in the first place. He could try to change the events that led to Hela's return, like stopping Odin from banishing Loki earlier. Another plot could involve Thor and his friends traveling to different time periods during Ragnarok to gather powerful artifacts to defeat their enemies. For example, they might go back to the time of the ancient Asgardians to find a weapon that can defeat Surtur.
In the Thor Ragnarok original story, Thor is obviously a main character. He's the son of Odin and has the power of thunder. Loki, his adopted brother, is also important. He's full of tricks. Hela, the goddess of death, is a major antagonist. She wants to rule Asgard. And Valkyrie, she's a former Valkyrie who joins Thor in his fight. There are also other characters like Odin, though his role is more in the setup of the story.
Hulk is another character that could be popular. His brute strength and his unique relationship with Thor in Ragnarok are great fodder for fanfiction. Writers might explore his time on Sakaar in more detail, or his interactions with the Asgardians when he finally arrives in Asgard.
The main characters are Thor, of course. Also, Hulk, Valkyrie, and Hela. Thor is the central figure trying to stop Ragnarok. Hulk is his friend and also an opponent for a while. Valkyrie is a strong female character who helps Thor. And Hela is the main villain causing all the chaos.
Adding a character like Amanda Waller would be interesting. She could be pulling the strings behind some of Peacemaker's missions, adding a layer of mystery and political intrigue. Or even bringing in a character like Green Arrow for a brief encounter to see how their different ideologies clash.
A psychic human. This character could sense the demons' movements and intentions before they attack. They could use their powers to help the Doom Slayer or other marines, for example, by warning them of an ambush or guiding them through a maze - like area filled with demons.
It's all about Thor's fight to save Asgard from the impending doom of Ragnarok. There's a lot of action, drama, and some unexpected twists.
The Lumpy Space Princess could be a great addition. She could be a sort of mentor to Jake Jr, teaching her about the ways of the different kingdoms in Ooo in her own sassy way.
Hermione Granger from the 'Harry Potter' series could be an interesting addition. She could use her magic knowledge to help the Ghostbusters understand the more esoteric aspects of the ghosts they're dealing with. Maybe she could even develop spells that work in tandem with the Ghostbusters' technology.
A mysterious old wizard could be added. This wizard could have a connection to Tavan's past and be a mentor figure, guiding him on his journey and teaching him new spells or skills.