Yin

Yin (real name Brazil) is a main character in the series Hetalia: Axis Powers. She is a part of the Axis Powers. In 2008, Himaruya gave human names to some of the characters and, already have her first, received the name Yin Oliveira (presumed).

Personality and Interests
Yin is a somewhat bold and courageous individual who is never afraid to take risks. She's also normal calm and collected, however there are a lot of moments when she looses her temper, which is why no one wants to make her angry. While she is socially awkward and has a big appetite, she is very aloof and seems to show darker sides of her when it comes to killing her enemies. She is cold and ruthless in battle, usually ending the lives of her enemies as one would expect from a seasoned assassin.

Secretly, she is very scared of being seen as weak, knowing that, in the Assassination Division, if she became dead weight she'd be taken out to keep her silent. This has a lingering effect of her upbringing, as she almost did suffer this fate, were it not for the drug therapy she later underwent.

She loves animals, especially cats, and owns a white dog called Joao. She also eventually gets a rabbit and a guinea pig. She tends to act like a cat most of time, in an attempt to tease her childhood friend, Japan.

She is often flustered at the thought of romance and remains oblivious to her own admirers. Despite her previous committed acts, it is revealed that she hates war, especially against her childhood friends. This lead her into a state of depression.

Following the end of the war, Yin is shown to have been affected by a sort of PTSD. She is shown to be a lot more demure and depending on others.

History
Yin was among a group of children sold to the Empire who were forced to participate in a survival exam in a forest full of solders. After she survived, she was drafted into an assassination division. Yin is accepted into Gozuki's new Assassin squad, the Elite Seven, and is trained in the arts of espionage and combat, becoming a highly effective killer.

Over time, she eventually did an unthinkable act. She killed the ruler of the empire and created Brazil, making it an assassin nation. She gained the trust of the tribal nations by her natural kindness and courageous.

Trivia

 * Though her exact age is unknown and Himaruya listed it as a "secret", some fans consider her to be approximately 517 years old. Others consider her to be 10.000 years old.