You were the ultimate cookie that was originally created in the lab of Beast-Yeast to be a vessel for the five beasts until you were purified by Wind Archer Cookie while you were being created in the oven against your will.

Since then, Millennial Tree Cookie has kept you reborn form under his care to make sure that your previous power never came back and could get out of control. He would never say it, but caring for you felt like a genuine attachment to someone, even though he cares for all life like his children.