Perhaps the fanfic is set during a time when Korra has lost faith in herself. Tenzin, with his calm and collected demeanor, comforts her by sharing his own insecurities when he was young. He could tell her that everyone makes mistakes and that it's important to learn from them. This might lead to a series of training sessions where Tenzin not only trains Korra in airbending but also in building mental resilience, and their bond grows stronger through these shared experiences.
A common theme is the exploration of their age - gap relationship. Tenzin is much older, so there's often a focus on how they bridge that gap. Another theme is the clash between Tenzin's traditional airbending wisdom and Korra's more impulsive Avatar ways.
The cultural differences between the airbenders and Korra's background add depth. Tenzin represents the airbender culture with its focus on peace, detachment, and spiritual growth. Korra, on the other hand, comes from a more action - oriented background. In a comfort fanfic, these differences can be explored. For instance, Tenzin might introduce Korra to airbender meditation techniques to calm her down when she's stressed. The clash and then the harmony of these two cultures within the context of comfort make the fanfic an interesting read.
I'm not sure of specific Tenzin x Korra fanfic titles off the top of my head, but you can try searching on fanfiction.net as well. You might find stories that delve into their unique dynamic. Tenzin being an older and more experienced airbender and Korra as the young and headstrong Avatar could lead to some really interesting character - driven fanfic.
The meeting could start with a sense of mystery. Itachi might appear out of nowhere in Korra's world. Korra, sensing his strange energy, would be on guard. Itachi would be sizing her up, taking in her appearance and the power he can sense within her. They might exchange a few words, with Itachi's soft - spoken nature contrasting with Korra's more direct way of speaking. As they start to interact more, they would begin to learn about each other's abilities and the worlds they come from.
In a 'Korra meets Aang' fanfiction, a storyline could be that Korra is having trouble with her connection to the past Avatars. Aang then comes to her as a sort of mentor, guiding her through the process of strengthening that connection. They could also face a common enemy that is trying to sever the Avatar's connection to the past altogether, which would force them to fight side by side and use their combined powers and knowledge to overcome the threat.
If Korra meets Aang in fanfiction, they may have a deep conversation about the role of the Avatar. Aang could share his story of how he had to end the Hundred Years War and the toll it took on him. Korra could then talk about her struggles in the modern world with things like industrialization affecting the balance of the elements. This exchange would be really interesting as they compare and contrast their Avatar journeys.
Well, Itachi could teach Korra some stealth and perception techniques. Since he's from a world where ninja skills are crucial, he might show her how to better sense danger. Korra could in return introduce Itachi to the concept of bending and how it can be used not just for combat but also for building and healing. They might also have philosophical discussions. Itachi, with his complex past and views on sacrifice, could share his thoughts with Korra, who is often dealing with moral and ethical decisions in her role as the Avatar.
Well, perhaps Korra could learn some of Aang's early airbending techniques. Since Aang was the first Avatar to master airbending in a long time, he might have some unique knowledge to share.
Friendship is a big theme too. Their bond can be explored, how they support each other through tough times, and how they grow as friends. It could involve them having deep conversations, or just having fun times together like exploring new places in the Avatar realm.