|Japanese name:||丹羽 菜緒子|
|School:||Shumoku Elementary School|
|Grade:||1st year middle school (Shinohayu)|
|Debut:||Shinohayu the Dawn of Age ch 18|
Naoko Tanba is the winner of the Nagoya elementary tournament during her 6th year at Shumoku Elementary School. Friends and classmates call her Niwa-chan (ni-wa is an alternate reading for the kanji in her surname).
Naoko has medium length black hair and dark eyes.
In her first appearance, Naoko comes off as quite arrogant, ordering her opponents to kneel down in front of her. It is later revealed that this was her opponents' idea, and that she simply expected them to honor their promise. It seems that Naoko has a very low tolerance for people who do not take things seriously, but otherwise she remains calm and reasonably polite.
Playing style / Abilities
She is very observant, spotting both of Kokoro's attempts at winning via trap. While attacking, she very aggressively goes for medium-sized open hands, even against opposing Riichi declarations.
Girls of Yumachi
After winning her region, she asks the competitors to kneel down before her like they said they would. When they do not, she says they take pride in being worthless and should take this competition more seriously.
Children's National Tournament Arc
In the third round of the tournament she plays against Shino Shiratsuki, Kokoro Oroku, and Chiyoko Takahashi. Before the match Kokoro insults Chiyoko and proposes that the losers have to perform dogeza. Kokoro then says that was the wager in Naoko's prefectural match. She tells Kokoro that it was proposed by someone else but she doesn't mind because losing would be more vexing. Shino then tells her that she cannot go all out if she has to worry about that so they decide that the losers have to buy the winners juice. At the beginning of the match, Shino wins with a riichi tsumo, but when she tries it once more Naoko manages to ron her. Naoko wins again off of Chiyoko but Shino overtakes her with another tsumo. Later Kokoro ends the match by busting Chiyoko. Shino and Kokoro advance to the next round.
When the match is over, she is seen with Chiyoko and is surprised that Shino bought them a drink. She asks Shino if it's out of pity but when she replies it's out of gratitude for playing with her, Naoko and Chiyoko accept it. However neither liked the taste of Durian and says that dogeza would've been easier. Later while watching the fourth round with Naoko, Chiyoko wonders if Shino and Kokoro will win the tournament. Naoko then tells her that only one can win and asks why Chiyoko played the 6-man which led to their defeat. She tries to get Naoko to change the subject by saying they should just drink their latte but to no avail. She then tells Naoko that she is sorry that her choice got her involved. Naoko then tells her that she doesn't really mind.