Nawaki

was a genin-level shinobi from Konohagakure's Senju clan.

Background
He was the younger brother of Tsunade and the grandson of Hashirama and Mito. He was also the grandnephew of Tobirama. He shared his dream of becoming Hokage with his sister on his twelfth birthday, who gave him their grandfather's necklace in the hopes that it would help him achieve his dream. The day after his birthday, Nawaki died in battle after running into an explosive trap. Orochimaru was with him, along with two other genin, implying that Orochimaru was his sensei. His body was so heavily mutilated that it was beyond recognition. The necklace was retrieved by Orochimaru and returned to a devastated Tsunade.

Personality
In terms of personality, Nawaki was very much like Naruto Uzumaki. He held the dream of becoming Hokage and was proud of the title and his grandfather's legacy. As the First's grandson he wanted to earn the title of Hokage and protect the village that his grandfather had founded.

Appearance
Nawaki had short light-brown hair, green-grey eyes and distinct blushes on his cheeks. According to Jiraiya, Nawaki resembled Naruto Uzumaki. For attire, he wore a dark teal poncho top and light green pants. He was also gifted with the First Hokage's necklace which he wore around his neck.

Search for Tsunade Arc
Orochimaru would later offer to Tsunade to bring Nawaki back to life, together with Tsunade's lover, Dan, in exchange for healing his arms. The resurrection would require a human sacrifice, though. She ultimately refused, realising that Nawaki and Dan would not want her to sacrifice the lives of others in exchange for theirs.

Trivia

 * Nawaki made a cameo appearance in the ending omake of Shippūden Episode 129, holding a balloon portraying Tsunade's face.
 * In the anime, flashbacks were seen showing Tsunade doing various chores like cooking Nawaki's meals. This strongly suggests that their parents were deceased and Tsunade was raising Nawaki.
 * "Nawaki" (縄樹) means "rope tree".

Quotes

 * (To Tsunade) "It's not just a necklace… The village is grandpa's treasure, I'll protect it! Because I am the grandson of the founder of Konoha, the First Hokage!…"
 * (To Tsunade) "Hey! I want to be like grandpa someday… I will be honoured with the name Hokage, because being Hokage is my dream."