Katara is one of the main characters in the Katara Avatar Graphic Novel. She is a waterbender from the Southern Water Tribe. She has long hair and is very skilled at using water in various forms for combat and healing.
In a 'Juvia Gets Drunk' fanfiction, Juvia would most likely interact with the members of Fairy Tail. She might start bothering Natsu, asking him silly questions like if he can really breathe fire while drunk. She could also interact with Happy, and they might get into some sort of funny exchange, like Juvia trying to teach Happy a new song she made up in her drunken state. And of course, she'll interact with Cana. Cana being the drinker she is, might find Juvia's drunk behavior either hilarious or relatable and they could have a long chat about different kinds of drinks.
Katara could be heartbroken. She might initially be in denial, not believing that Aang has actually left. Then she could become angry, feeling betrayed by Aang's sudden departure.
The relationship can start with mutual curiosity. Naruto is curious about Juvia's magic and Juvia about Naruto's ninja abilities. They begin to exchange knowledge, which brings them closer.
Their relationship would likely become more serious. They would have to think about not just themselves but also their baby. There would be more commitment and responsibility between them.
Some fanfictions explore their role in rebuilding the world after the war. Zuko and Katara could be working together to restore balance between the nations. This kind of fanfiction often shows their leadership skills and how they complement each other.
Toph could be another main character. She has a unique perspective and her earthbending skills could be useful in various situations while dealing with baby Katara. For example, she could create a safe enclosure for Katara when they need to rest. Also, Gran - Gran might play an important role. She has a lot of wisdom and experience, and she could provide some insights on how to deal with a baby and perhaps some clues on how to reverse the transformation.