Maybe Talion could help Frodo on his journey to destroy the One Ring. He has his own combat skills, so he could offer protection against the various threats that Frodo faces.
One common theme is the clash of cultures. Frodo, being a hobbit, and Thorin, a dwarf, have very different upbringings and ways of life. Their meeting often leads to misunderstandings at first, which then turn into mutual respect as they get to know each other better.
If Harry Potter meets Gandalf in fanfiction, it might be a situation where they team up to fight a common enemy. Gandalf's experience in dealing with dark forces like Sauron could give Harry some great strategies to deal with Voldemort. They could combine their powers, like Harry's Patronus charm and Gandalf's light magic, to drive away the darkness.
Some Tolkien - focused fan communities and forums might also have links or even their own collections of 'thorin meets frodo' fanfiction. You can join these communities and ask around for recommendations. This way, you can also engage with other fans who might have similar interests.
In some fanfictions, thorin meets frodo while Frodo is on his journey towards Mordor. Thorin, being a warrior, offers to accompany Frodo for a part of the journey. They face some challenges together, like dealing with orcs. This experience strengthens their bond, and they learn from each other's courage and resourcefulness.
I'm not sure of specific 'Talion meets Frodo' fanfiction off - hand. However, you could also try joining fanfiction communities or forums related to either Middle - earth (where Frodo is from) or the game that Talion is from. Ask the members there if they know of any such interesting crossovers.
One popular 'Frodo meets Thorin' fanfiction might be 'The Unexpected Encounter'. It delves into how Frodo, from the Shire, and Thorin, the dwarf prince, cross paths in a world filled with challenges. Their different cultures and personalities create an interesting dynamic, with Frodo's gentle nature contrasting Thorin's proud and somewhat stubborn ways.
I'm not sure which specific story Gandalf is telling as there are many in the Tolkien's works. Maybe it's about the history of Middle - earth, like the battles against the dark forces or the tales of the rings.
It's hard to say. Gandalf has a lot of raw power and experience. He's faced some really tough foes in Middle - earth. But Harry Potter is no slouch either. He's got his own set of powerful spells and the ability to think on his feet. However, I think Gandalf might have the edge. His magic is more of an all - encompassing force, and he's had centuries to master it.