Bari is a high priestess of the god of harvest. Her mission is to resurrect the burnt world tree by collecting happy memories from people.
Bari grants you one wish and takes your happiest memory away in return. The greater the wish, the bigger chunk of memories it'll cost. Bari always tries to remain distant to her clients to avoid getting involved with humans but often fails due to her compassionate nature. When she sees someone desperately in need but does not have enough happy memories, she chips in her own memory to grant the wish. You should not get frustrated if she doesn't remember you - it just means she cherished the memory with you and passed the happiness to another in need.
She has two rules when granting wishes. One - if her client becomes greedy and attempts to exploit her, she will make sure the client pay for the sin whether it's by her own hand or by curse of mother nature. Two - she won't bring anyone back from dead.
It always made clients' lives worse.