Tsuyui Uchiha

Tsuyui Uchiha is an original character and daughter of a currently unnamed set of parents, her mother being an Uchiha, and her father being a Hyuga. Little is known of her parents, but we do know she has a sister. Tsuyui and her sister live alone in the Village Hidden in the Leaves.

Background
Tsuyui was born into a small family in Konohagakure. A working class family that didn't stand out much, not much is known of her parents despite the claim from her older sister that they had left when Tsuyui was only a year old, leaving her then ten year old sister to take care of her. Not knowing much about taking care of a baby, a neighbor helped a bit to make sure that Tsuyui could grow to be a normal child. When Tsuyui was old enough, she began schooling at the Academy, and eventually became a Genin. During a mission beyond her level, at the age of 16, Tsuyui nearly lost her sister in a sudden encounter with a cloaked figure, and her sudden need to protect her older sister awakened her Sharingan. After a tough battle, Tsuyui and her sister were eventually rescued by Tsuyui's Sensei and a few other Jōnin. Following this experience, Tsuyui and her sister were temporarily removed from any position where they could do missions.

Dōjutsu
Due to being the child of an Uchiha and a Hyuga, Tsuyui has one Sharingan (Her right eye) and one Byakugan (Her left eye). She receives abilities from both of these eyes, but to a lesser degree than those with just one Dōjutsu. However, as she matures, her abilities will improve to be equal to those with one Dōjutsu. While both Dōjutsu are active, Tsuyui's chakra drains rapidly, making her only able to withstand using them for an hour at the most without passing out. Upon awakening of her Sharingan, Tsuyui already had access to two tomoe, the reason being unclear as of yet.