It is not really confirmed but I'll tell anyway.
You know how Uchi's always act Tomboyish? The main character of our story today,will be Deirdre.
Deirdre is from a poor family. Her mother washes clothes for their neigbours as a living,while her father fixes old,worn out shoes. Their jobs are not dependable source of income,so sometimes they do not eat at all. They do not buy things like toys,jewelry,furniture, because they cannot afford them.
Deirdre is the eldest of 4 children. The younger children usually get bullied by other kids,due to the fact that their family is poor.Since Deirdre is the eldest,and they have no older brother to protect them,Deirdre decided to act like the 'big brother' of the family,protecting her siblings and taking part time jobs anywhere.Which lead her to acting more boyish and less feminine. When somebody gives her free items, she smiles because she was not used to having items for free. Nor even having items at all.
So when Uchis buy from you,always give them a freebie.