Her mother worked as an ANBU, thus barely giving Aria any attention. Her father, on the other hand, worked as a clown, performing in the broken streets and trying to earn money. In order to be protected, her mother suggested them to travel, and he agreed to it. Aria developed a love for traveling and enjoying nature. Not only that, but her parents were her role models. Being a silly child, she decided to make her goal to be a ninja who's also a clown. As silly as it was, she was willing to fight for it.
At first, Ninjutsu wasn't her skill, and when her father enrolled her into the Hidden Leaf's academy, she constantly failed year after year. It wasn't until her mother died that Aria's goal became that much more important for her. Not only did she want to replace her mother so she doesn't get forgotten, but wanted to protect her father. The following year she managed to pass with flying colors. Fresh out of training, she was now a Genin.
From that moment on, she started what she loved doing best; entertaining the public. She would take her father to restaurants, shops, and all kinds of silly places thanks to doing missions and getting some money. As far as teammates go, however, she didn't try to bond with them. Sure, they talked to her and tried to get to know her, but she didn't bother remembering them or any of the sort.. not after her mother had died. It seriously closed her heart...
By the time she had reached 18, she had done 20 D-Rank missions, 10 C-Rank, and 3 B-Rank. The reason she refused to do any A-Rank or do any more than three B-Rank is because she didn't want to die. Although silly for a ninja to think, she wanted to be there for her father, and in those three B-Rank missions, she had nearly died in some way. Of course, once her father trusts somebody else and is taken good cared of, then Aria can go all out and do as many crazy missions as she likes...
But then that day came. Before she had turned 19, her father had passed away from murder. It was unknown as to who, but the ONLY time she trusted her father to go alone somewhere... he was murdered. Her heart had completely been sealed. Her eyes did not show a kind, happy soul, but a broken and depressed one. She doesn't place her trust on anybody... yet.
She started to do harder missions, although only managed to complete 2 B-Rank, before finding a small apartment complex and settling there. Ever since she started to settle and try to calm down. Of course, she had tons of energy and entertained children on the streets, which is why plenty of children call her "Trickster" or "Aria-chan." Many were unable to pronounce her real name, Artaria, and thus came up with Aria.
She accepted it as a name and called herself Aria.