Their relationship could start as a mutual respect for each other's skills. Katooni admires Pietro's speed, and Pietro respects Katooni's Jedi training.
As they go on adventures together, they would start to rely on each other more. For example, in a battle against a Sith lord, Katooni might be able to use the Force to protect Pietro from a powerful dark side attack, and Pietro could then use his speed to strike back at the Sith. This would deepen their bond.
They could go on a journey to discover an ancient Jedi artifact. Katooni's Jedi skills and Pietro's unique abilities would combine to overcome various obstacles like Sith traps and dangerous alien creatures.
One potential friend could be Petro. Since they are both younglings at the Jedi Temple, they might bond over their shared experiences in training and their eagerness to become great Jedi. They could support each other in lightsaber duels and in their studies of the Force.
Their relationship could start with mutual respect due to their Jedi training. As they go on adventures together, they'd grow to trust each other more. For example, in a fight against the Empire, Ezra might save Ahsoka's life, deepening their bond.
As they work together more often, they might develop a friendship. For example, Ezra could teach Leia some of the more unorthodox ways of using the Force that he learned from Kanan, and Leia could introduce Ezra to the broader political landscape of the Rebellion. This exchange of knowledge would bring them closer.
As they go on adventures together, their bond would strengthen. They could face a great enemy like a powerful dark side user. In the heat of battle, they would rely on each other and start to trust more deeply. Ahsoka might see some of Anakin in Luke, which would make her more protective of him, and Luke would see Ahsoka as a wise mentor figure.
Katooni is a young Jedi. Petro is also a Jedi. In fanfiction, Katooni can be developed by exploring her growth as a Jedi. For example, she could face a personal crisis where she has to choose between the Jedi Code and her own emotions. Petro can be developed by showing his journey to become a more patient and wise Jedi. Maybe he gets into trouble because of his impulsive nature and has to learn from it.
Ahsoka Tano would be a great character to pair with Katooni. They are both Jedi Padawans and could have some really interesting interactions. They could learn from each other and go on adventures together. Another good option could be Obi - Wan Kenobi. He could be a mentor figure to Katooni and guide her in difficult situations.
The relationship could start as a mentorship. Shaak Ti, being an experienced Jedi, could initially see Ahsoka as a young, promising Jedi in need of guidance. Ahsoka, in turn, would respect Shaak Ti's wisdom and skills. As they go on missions together, they would grow to trust each other more deeply, like comrades in arms.
Their relationship could develop as they train together. Ezra would learn more refined Jedi techniques from Ahsoka. This would create a deeper bond of respect and mentorship.
Their relationship could develop further through shared battles. As they fight side by side against the Empire, they learn to trust each other even more. Each battle they survive together deepens their bond.