Kiba

He was hurt by everyone in his life
His father was an alcoholic
his mother abandoned him because his father would yell at her and get violent 

kiba spent every day trying to be as quiet as possible to avoid getting in trouble, he barely even spoke...even with all that effort he still got yelled at pretty much every day and that was the "lucky days" where he wouldn´t get hit

When he got his blessing his father was angrier than ever and got extremely drunk before deiciding to leave kiba inside the house by himself with the doors locked and barely enough food to eat...

after the days passed he got weaker and weaker until he could barely stand up... at this point he had spent every day growing his hate towards his father and everyone for leaving him until the point his anger exploded and he couldnt control his blessing at all... he ended up breaking the house to pieces and burning it all up in order to escape from that living hell

the people of the town got to know everything days later and started to hate him/avoid him for being dangerous because his father told them all a huge lie and they believed it

so he ran away as far as he could to a forest far far away.. hoping to finally be free from all the pain he had experienced

He swore to himself to never trust anyone ever again, that they would all betray him

After a few days of starving he was found by a pack of wolves that decided to take him in and raise him as one of their own...

As years passed by he became more and more wolf like...but the memories of his past still remained as they were too painful to forget

[at this point kiba is 17]

He got into a fight for power, he wanted to be the leader but he lost.. resulting in him being badly injured 

He ran away from there as he no longer was part of them but he was loosing so much blood and had nowhere to go... So he stopped running after a while and just waited for his death.

that was until a girl pale as the snow found him and quickly tried to help, but he couldnt trust her...he growled at her in hopes she would leave but she was stubborn and kept trying to get closer until he was too weak to push her away

so he gave up and let her heal his wounds until he passed out of exhaustion and probably loss of blood

after he woke up he saw many faces staring at him and he stood up in defense, until the girl he saw before stopped him and told him to sit down

somehow he felt closer to her since she had saved his life, so he did what she said  

And so he only stayed next to her since then, this misterious young lady is Lyra (she is 15 here)