After the initial shock and sadness, Twilight often becomes determined. She decides that she will not let the betrayal break her. In a story where she is abandoned in a dangerous realm, she uses her magic and wits to find her way back and also to expose those who betrayed her, showing that she is stronger than they thought.
In some fanfictions, Twilight might be betrayed by a new pony in town. This new pony befriends Twilight, gains her trust, and then uses that trust to get access to the library's restricted section. Once inside, they steal a powerful magical artifact, and Twilight is left to take the blame for the security breach, feeling deeply betrayed.
Ichigo would also experience a period of sadness. He values his relationships, and when one is broken through betrayal, it would hurt him deeply. He might isolate himself for a while, brooding over what happened. But ultimately, he would use this experience to become stronger. He'd learn from it and be more cautious in future relationships, while still maintaining his core values of loyalty and trust.
He could feel a great sense of anger and sadness. Naruto has a big heart, and being betrayed by someone he considered a friend or ally would be deeply hurtful. He might start to question his own judgment in trusting Mavis. And then, he would likely try to find out the reason behind the betrayal. He's not the type to just let it go. He would pursue the truth, whether it's to get revenge or to clear up any misunderstandings.
At first, Naruto would probably be extremely shocked and in denial. He has always looked up to Kakashi as a mentor and friend, so the idea of being betrayed by him would be hard to accept immediately.
At first, Percy could be in shock. He can't believe that the gods, whom he has served and trusted, would betray him. But then, as the reality sinks in, he might become determined to get justice. He starts to plan his next moves carefully, using his wits and the skills he has learned over the years. He may also feel a sense of sadness and loneliness, as he realizes he is now on his own against the powerful gods.
Naruto would probably be extremely hurt. He is someone who values friendship and trust deeply. So, he might initially be in shock and disbelief. He would likely feel angry too, but his anger might be mixed with sadness.
She might become angry at first. Natsu is known for her fiery temper. So, she could lash out at the person who betrayed her, confronting them directly and demanding an explanation.
Typically, it starts with Twilight realizing she's pregnant. She might feel a mix of emotions like excitement and fear. Then she'll start to make preparations, like finding a safe place to have the baby. Her friends will often be involved, offering their support and advice.
He might initially be shocked and confused. Natsu has always been so loyal to Fairy Tail, so this would be a huge blow to him.
Bella might go into a deep depression. She was so in love with Edward, and his death could shatter her world. She could become withdrawn and isolate herself from her friends and family.