She couldn't remember her past life. She couldn't remember her parents, if she had any siblings, or even her birthday. Ghost knew. He saw her whole life when he first revived her. But she never listened. That life was a thing of the past.
She gave up on trying to learn about her life a long time ago. She had hardly had more than a few minutes to herself when she first became a guardian. At the time, she couldn't seem to accept that she had a whole life that she didn't know about, a family that no longer existed - but now had to fight day and night for a cause she hasn't signed up for. So she threw herself into the fight. She made herself indispensable. And along the way, the constant battles, and countless deaths made her realize that there wasn't any depth to her life anymore.
She was never hungry. She supposed the light that kept her alive took care of that. She didn't necessarily need sleep. It seemed that she never ran out of energy. She had become numb to death. She still felt pain, felt every bullet and punch as hard as the next, but preservation of life was a thing for the mortal. She was an empty shell. A deathless solider. Everyone spoke as if the light was a blessing. That guardians were the angels for humanity. But she was living a hell everyday, and in her darkest hours, she wondered if the light was actually "good" if it could put her through so much pain.
The scars accumulated on her body told many stories that had no audience. Every friend she tried to make seemed to die within the next few days, their ghost destroyed, no chance of revival. Sometimes it was intentional. She had seen too many hopeless guardians destroy their own ghosts before throwing themselves from the top of the tower. She had given up on trying to get to know others not long after she arrived. The Vanguard was the only constant. Until Cayde-6 died.
Fear was something that always brooded in the back of her head. Fear of death didn't exist. But the fear of not existing was very much present.
Although she never needed to sleep, she found herself constantly wandering back to her room in the tower to close her eyes for a few hours. She never felt more refreshed when she woke up. It just silenced the voices in her head.
Occasionally she get the notion that she's been somewhere before. Or that some locked memory in her head had been captured in that location. As hard as she tried she could never dig any deeper. She had learned to brush it off. Ignore any previous attachment she may have had, and focus on the mission at hand.
Regardless, it still bugged her.