Another possibility is that Loki teams up with other characters. He could form an alliance with the Avengers or some other powerful beings in the universe. Together, they could come up with a plan to stop Thanos. Loki could contribute his unique skills, like his ability to shapeshift and infiltrate Thanos' ranks, and then they could launch a coordinated attack.
Power is a common theme. Both Thanos and Loki are power - hungry in their own ways. In fanfictions, they often either compete for power or try to use each other's power for their own goals. Another theme is redemption. Sometimes Loki is seen as a way for Thanos to find redemption, or vice versa.
There might be a moment where Loki discovers a crucial piece of information about Thanos. For example, he finds out the true source of Thanos' power and figures out how to cut it off. This discovery could be a turning point in the fanfiction.
It's hard to say. Loki has a wide range of magical abilities from Asgard. He can shape - shift, create illusions, and has a certain level of telekinesis. However, Harry Potter has the power of love and friendship on his side, which has proven to be a very strong force in his world. Also, Harry is very skilled at defensive and offensive magic within the wizarding world. So it really depends on the situation.
In fanfiction, Loki's time with Thanos could involve Loki trying to outwit Thanos. Maybe he's forced to do Thanos' bidding at first but secretly plans to undermine him. He could be gathering information about Thanos' plans and weaknesses.
One popular 'Thanos loves Loki' fanfiction might be 'The Unlikely Affection'. In this story, Thanos' love for Loki is a complex mix of his admiration for Loki's cunning and his own sense of dominance. Another could be 'Loki's Allure to Thanos' which delves into how Loki's charm and unique abilities draw Thanos to him in a way that challenges Thanos' usual cold - hearted nature.
Another way is that Thor teams up with other allies. Maybe he gets help from the Avengers or some other powerful beings from the Marvel universe. They could create a diversion while Thor sneaks in to save Loki. Thor could also use his battle experience and strategic thinking. He might figure out Thanos' weak points and use that knowledge to rescue Loki. For instance, if Thanos has a certain device that is powering his hold on Loki, Thor could destroy it.
In this fanfiction, it could be that Harry's power stems from his experiences. He has faced numerous dark wizards and challenges, which have forced him to grow stronger. Merlin, on the other hand, might not have had such intense and varied experiences. So, through his trials, Harry has developed powers that surpass Merlin's.
Some people write 'Thanos loves Loki' fanfiction because they like to explore unconventional relationships. The contrast between Thanos' brutality and Loki's mischievousness makes for an interesting dynamic. It allows writers to delve into the psychology of two complex characters.