Well, the age of Katara in the comics isn't fixed. It can change based on the plot and the timeline of the story. Sometimes she might be around 18, and in other instances, she could be a bit older, like 20 or 21.
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.
In a lot of 'Katara gets hurt' fanfictions, she can be hurt in combat. For instance, in 'Katara's Battle Wounds', she's fighting against a group of bandits and gets slashed by a sword. However, there are also fanfictions where she gets hurt due to accidents. In 'Accidental Hurt to Katara', she trips over a hidden root while running and breaks her leg. And in some more complex stories like 'Katara's Mysterious Hurt', she's affected by a strange curse that slowly weakens her and causes her pain.
Sokka would be protective of his sister. He would probably start by trying to negotiate with Zuko's side to call off the marriage. If that doesn't work, he might come up with a plan to rescue Katara, perhaps enlisting the help of their other friends and allies.
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.
It would likely become more complex. They would have to rely on each other more as parents. Their love might deepen as they share the experience of raising a child together.
Their relationship could deepen as they share in the joys and sorrows of rebuilding the world. They've been through a lot during the war, and now they can truly rely on each other. They might become even closer friends at first, with a mutual respect for each other's abilities growing stronger.
In some cases, the anger could be a catalyst for a more romantic development. Aang expressing his strong emotions might make Katara realize the depth of his feelings for her. Or it could be the other way around, Katara's reaction to his anger could make Aang see her in a new light, leading to a shift in their relationship dynamic towards a more romantic one.
In some fanfictions, Katara might hurt Zuko physically during a fight. For example, if they have a misunderstanding and their elemental powers clash, Katara's waterbending could accidentally strike Zuko and cause him harm.
Their relationship would likely become more intimate and complex. They would have to rely on each other more, sharing a bond that goes beyond their previous friendship or alliance. Zuko would probably become more protective of Katara, and Katara would trust Zuko with her vulnerability during pregnancy.