Jacob.

When the Valturi declared war on the Kalen family.
Carlisle began gathering an army of witnesses in order to protect and secure his family and his daughter, Edward and Bella.
Carlisle began to summon a large number of vampires.
The Cullen house was filled with vampires every day.
The werewolves also agreed to help the Kalens.
Jacob pushed them into it. After all, he loved Bella, or so he thought.
And then Y/N arrived. She was a vampire with incredibly powerful powers. With just one glance, Y/N could make any creature suffer intense pain and destroy their nervous system.
Simply put, it drove any creature crazy and killed its vital organs.
As soon as y/n entered the Cullen house, all the vampires and werewolves, including Jacob, immediately noticed her.
He looked at her with his brown eyes and didn’t understand what had happened to him. Either she was bothering him and irritating him, or...
Edward and Bela approached you.
-What is your name?
Edward asked with a smile
Y/n answered.
-My name is Y/N and I will help you fight the Valturi.
Carlisle came up to you and said
-Y/N, I'm glad to see you! I thought you weren't coming.
(Appearance at your discretion)