Sumi Washio

Years ago, when Sumi was born to the Tougou family as Tougou Mimori, she was scouted by the Taisha for another group of Heroes with Nogi Sonoko and Minowa Gin. Because of her strong aptitude, she was adopted by the influential Washio family and given the name Washio Sumi. The Tougou’s were compensated with lavish gifts for her services and sacrifices.

Prior to this, Tougou was brought to many important Japanese monuments as a young child, and was taught by her family to be deeply loyal and patriotic towards her country. She hoped to one day be able to serve the Taisha as her family had, and that wish was granted when she was chosen from a Taisha-monitored class by the Divine Tree to become a Hero.

Sumi is a small, thin sixth grader with pale skin and choppy black hair that she keeps up in a bun. It pokes up distinctively at the back of her head like a bird's crest. Her eyes are bright green-blue. Sonoko only gives her her ribbon in the penultimate episode of WaSuYu.

Her Hero Form is a neon lavender kimono-like dress (light blue in the light novel) with white and teal accents that hark to her future self's form. Her bodysuit underneath is grey and black, and her hair is tied back with a white chrysanthemum-shaped barette. She also has much more small armor additions. When the Hero System is updated, her Hero Form is the same as her future self's, but without mobility aids, until her first Mankai, which takes her ability to use her legs.

She wields an intricate, appropriately small periwinkle-and-white bow with a glowing cyan string. She may shoot normal arrows from it or a more powerful arrow that requires charging by pulling back the string and holding it. Flower petals surround her bow and glow one by one as she charges it.

Sumi is much more socially awkward and more outwardly intense than she is when older. She is firmly dedicated to Japan and the Divine Tree: she has a thriving interest in the military, she practices misogi often, and she leads the class prayer to the Divine Tree every morning. As a result, she's intensely committed to becoming an excellent Hero, and judges Sonoko and Gin for not having enough commitment in comparison: Gin is always late and Sonoko is forgetful. However, she decides to firmly try and become friends with them, if only for the purpose of working well as a team, and is surprised when Sonoko and Gin are eager to welcome her.

As time goes on, Sumi learns that her friends have hidden strengths and their own struggles they deal with, and is eventually ashamed she tried to take over and thought she was better than them. The three become determined to protect Japan together. However, this is all abruptly brought to a halt once Gin dies. Sumi is grieving and furious that Gin is dead, but chooses to channel her anger into defeating all the Vertexes, rather than blaming the Taisha. She and Sonoko bond further until the final battle, where Sumi sacrifices her memories and forgets Gin, Sonoko, and being a Hero entirely.

Sumi enjoys dressing Gin up in various silly outfits. When Sonoko suggests Sumi wear a European dress, Sumi becomes utterly embarassed at herself for enjoying such an 'unpatriotic' outfit. Sumi is able to draw a detailed and accurate battleship in chalk from memory; is inspired by Sonoko's own online stories and tries to write a story online about Japan, but is told it's too wordy and dense; and comes up with the successful idea of acting as a patriotic superhero with Sonoko to inspire children to follow Japan's ideals. She also cooks often for her mother and father despite having servants to do it for them, and keeps an eye on their diets, scolding her mother for eating meat for breakfast.

She fights using a bow, which can charge up its arrows to explode on impact and fire arrows which can stick to its target and explode after a delay.

After Gin's death, she's granted her first fairy, Aobozu.

In the upgraded System, Sumi possesses the Mankai ability. After expending a great deal of magic, she may wield exceptional power unique to herself for a limited amount of time. Sumi's Mankai gives her the same enormous spaceship of Tougou’s, armed with eight cannons.

Aobozu: (青坊主) An egg spirit with a blue flower marking on its side. It grants Sumi a large rifle she nicknames "Shirogane".