Excel is the human contractee of Steiner, a high Tera Guardian from the German High-Council.
Excel's real name is Maria. As a child, Excel was born as an elder daughter of a warlord from a fiefdom of abundance and wealth. She has one younger sibling, a brother Klaus in the anime. After her parents passed away, Excel took over their duties to lead their fiefdom until Klaus reached of age to take over. One day, the village is slaughtered by Alter Egos and set on fire. Klaus is killed in the invasion while visiting the villagers to thank them for the food offerings. Upon viewing the fire from her palace balcony, Excel runs into the village to find her brother, only to discover his dead body. As she mourns her brother's death, Steiner asks her to make a contract with her to make Steiner stronger in order to avenge her villagers' death. By doing so, Excel became a part of The Noble Ones with Steiner ever since.
Excel is calm, collected, mature, and seemingly bored during duels.As a veteran contractee, Excel has gained considerable experience and a keen insight. She has much confidence in her partnership with Steiner and in their own abilities and strength.
Despite her outward appearance, Excel is shown to be fragile especially towards Steiner. In her fight with Kuro, her disinterest quickly turns into worry after Steiner is hit by Kuro's Exceed.
She also has little tolerance for insolence.Because of her mutation that causes her childlike appearance, Excel embodies the fact that one should not judge others based on appearances, reminding people, such as Keita Ibuki and Mikami of it from time to time. In Steiner's fight with Kuro, she calls Kuro and Keita "kids" and "young contractees" during their battle. She also notes that they did not need to synchronise to win and is more engrossed in her video game rather than the fight.
However, after the fight, she states that Steiner only did what was necessary as they were provoked first and apologises. During their visit to Akane's place for tea, Excel shows refined table manners and politeness towards them as well as indicates her love for plain Earl Grey tea.
She is also shown to have a romantic interest on Keita, proven by kissing him.
Excel has long blonde hair, cut into bangs, and dresses in a young girl's outfit. Despite having lived for a long time, Excel looks like a young girl. Her childlike appearance is the result of a mutation caused by her contract with Steiner which severely slows down her physical growth and aging process.
Excel is always shown playing a mermaid game on her gaming console, having an expressionless face while doing so. When talked to by Steiner, she replies without looking up from her video game.
Excel and SteinerEditExcel and Steiner are a strong duo from The Noble Ones with a hundred years of fighting experience together. Because of which, Excel is shown to have much faith in Steiner's strength and is convinced that they were undefeatable together. Although Steiner was the one who approached Excel in the beginning, Steiner respects Excel's decisions and follows her lead. In their fight with Kuro, Excel reprimands Steiner for continuing the fight although she wanted them to stop, showing her dominant side in the relationship as well as Steiner's respect for her when he backs off. When Excel realizes that Steiner had died in the fight against Reishin and had used a clone to save her, she cries and tells Steiner not to leave her.
She possesses several combat accessories called "thousands", but only two are shown in the manga. One is the Hexa Ring she wears creates the Hexa Shield which blocks attacks, while the other one is the ring she gave to Keita. In the creation of the Hexa Wall, Excel forms a triangle in front of her with her face. The Hexa Ring is able to block off attacks of great intensity and Excel uses it to protect both herself and Steiner in battles. However, the Hexa Wall was shown to break under consistent attacks from Reishin. After the battle, Excel upped the abilities of Hexa Wall to be able to be cast anywhere rather than only in front of her, as well as to absorb attacks and reflect them at opponents, both of which she used against Reishin in the Pure Place.