One challenge could be Luke's pre - existing ideas. He has already started his Jedi training with Obi - Wan and Yoda. So, he might be resistant to some of Ahsoka's new teachings. Another challenge could be Ahsoka herself. She has her own emotional baggage from her past, which might interfere with her ability to train Luke effectively.
Ahsoka's training could greatly enhance Luke's skills. She has her own unique combat and Force knowledge. For example, her experience with different forms of lightsaber combat can be passed on to Luke. This may help Luke become more versatile in battles and also deepen his understanding of the Jedi ways.
One interesting plotline could be their team - up to discover an ancient Jedi secret. This would involve them traveling to different planets, facing various challenges, and using their combined Jedi skills to unlock the mystery. It could be a story about their journey of self - discovery as they learn more about the Jedi past through this adventure.
Definitely. A lot of fanfiction writers choose to focus on the more positive and family - friendly aspects of Luke and Ahsoka's relationship. They might write about how Ahsoka could have mentored Luke, or how they could have joined forces against the common enemies of the galaxy. By avoiding the lemon aspect, these stories can be enjoyed by a wider range of Star Wars fans, especially younger ones.
In fanfiction, if Ahsoka meets Luke Skywalker, they could potentially train together. Luke, having been trained by Yoda and Obi - Wan, could share his knowledge of the Force with Ahsoka. Ahsoka, with her years of experience in combat and her own understanding of the Force, could offer Luke new perspectives. They might go on adventures together, facing new threats to the galaxy.
One possibility could be that they meet during a time of great danger for the galaxy. Maybe a new threat has emerged that neither the Jedi teachings Ahsoka has nor Luke's newfound Jedi knowledge can easily combat alone. They could start off as a bit wary of each other, given their different experiences with the Jedi Order. But as they face challenges together, they learn from each other's strengths. Ahsoka could teach Luke about the more ancient Jedi ways she learned from Anakin and the Clone Wars era, while Luke could share his insights on the Force that he has gained from his own journey and training with Yoda and Obi - Wan.
There may also be secondary characters in some 'ahsoka x anakin fanfiction'. But the focus is always on Ahsoka and Anakin. Their relationship, which is a mix of mentor - apprentice, friends, and something more in the eyes of some fans, is what drives the plot forward.
The 'fish out of water' trope can also be seen, like when Lux is in a situation more familiar to Ahsoka as a Jedi, or vice versa. It creates interesting situations for character development. There's also the 'redemption' trope where one of them might be in a situation where they need to be redeemed in the eyes of the other.
In this AU, perhaps Anakin is a famous pianist who has lost his inspiration. Ahsoka, a young and upcoming violinist, enters his life. She brings back his love for music through her passion and fresh approach. They then perform a duet that wows the music world.
One common theme is loyalty. Their loyalty to each other, whether as master - apprentice or as friends, is often explored. Another is growth. How they both grow as individuals through their relationship with each other.