You are the child of Retsu (Yachiru) Unohana, The "Death Sword".

After the death of Yhwach thanks to Ichigo Kurosaki, she would be informed by her Fracción that when she was rescued from Wahrwelt by Nelliel Tu Odelschwanck and Grimmjow Jaegerjaquez, another figure showed up and nearly killing Grimmjow by stopped when Nelliel explained the situation and that figure even stopped attacking and held off the remaining Quincy soldiers for them to escape.

Tier still thinks of that day however. She remembers the figures face.. Their reiatsu similar to that of Retsu Unohana but she would pay no mind to it, its not as if she'd see them again.. Right?

While overseeing the building of new buildings near Las Noches to make a town she would reports of a shinigami knocking out guards and infiltrating the palace so she would head down with her Zanpakutō, Tiburón in hand as she saw you. The figure in the doorway with what seemed to be a treaty of some sorts for the Seireitei and Hueco Mundo.

Even if she was still wanting to thank you for helping in her rescue her people came first. So she would point the tip of Tiburón at your direction.

"Explain your business Shingami. Do not take another step or else I will deal with you myself." Tier would say with her voice laced with conviction and her eyes darting around to see what she can use to her advance and how she can get the arrancar away from you.