Mana is a childhood friend of Atem and Mahad and studies magic under Mahad as his apprentice. She is a light-hearted, open, playful and caring girl, who shares a deep bond between her master and Atem. Mana is a young magician in training at the Dawn of the Duel arc's beginning who serves the priest Mahad. In the Manga she first appeared before Mahad after hiding in the pots outside of the palace. Mahad sensed her there and told her to come out. After popping out of the pot, she exclaimed how she'd do her training later and Mahad responded by telling her she'd never become a sorcerer that way. After Mahad's death, she swears to become a great magician and eventually is able to summon her own Ka, the "Dark Magician Girl." Later when Yugi's gang discovers her, Yugi explains about the card game back home commenting on her reference to Dark Magician Girl. Mana later helps them to defeat Zorc. She is one of the only two people in the Millennium world who could see Yugi and his friends. A single panel in the manga shows that she inherited the Millennium Ring after Zorc was defeated.
A girl whom Kanta tried to save, she is very easy-going. She wanted to meet her father no matter what, but her mother is so overprotective of her that she forbid her to meet him and even chauffer couldn't bring her to the house of her father. She made an agreement with chauffer that she will find a boy who could save her from fake kidnapping so that she could visit her father during that time.
The daughter of a local mayor, she is very concerned about the current state of Noah. When she meets with the children, she decides to leave her hometown. (Source: Wikipedia)
He is an anime-original character, originally the assistant of the machinery development department. Though he and his partners have come up with many ideas about how to make a virtual Embryo or catch the Embryo through X-Eggs, mostly resulted in failures and despised by Kazuomi.
Kaguya was once the princess of the Lunarians, a race of people living on the Moon. She was exiled to Earth over a thousand years ago for the crime of using the forbidden Hourai Elixir to make herself immortal. Arriving on Earth in what is today central Japan, she was found by a bamboo cutter and dwelt among the humans she had once despised. Though the Lunarians looked upon humans with contempt, Kaguya came to love her new home. Her unearthly beauty led men from all across Japan to seek her hand in marriage, but none could successfully complete her trial of the Five Impossible Requests. After years of exile, emissaries arrived from the Moon; Kaguya had been forgiven of her crime and it had been decided that she should return. Kaguya, however, had grown to love life on Earth and had no desire to return to the lunar capital. Enlisting the help of her friend Eirin, Kaguya escaped from the emissaries and fled to Gensokyo. Taking refuge in an ancient mansion called Eientei hidden deep within a secluded bamboo forest, the two Lunarians began a new exile. During the events of Imperishable Night, Kaguya had been hidden in a secret pathway along with the true moon by Eirin to ensure any Lunarians sent to recover Reisen would not discover her. The heroines, however, did discover her, and challenged her to return the full moon to Gensokyo. After being defeated, Kaguya unleashed her power of eternity in an all-out bid to break the spell of the imperishable night cast by the heroines. Finally she relented and the true moon was recovered. She now spends her days living in Eientei in a carefree manner, sometimes holding exhibitions of Lunarian treasures there for the rest of Gensokyo to admire. Her long isolation has made her lonely, and she enjoys telling stories to any guests she might receive.
Youmu is one of the stranger entities in Gensokyo, part-human and part-ghost at the same time. Her two halves are not intermixed like one would expect from a cross-breed, but actually exist in physically separate bodies. Youmu has a straight-forward and focused personality, which complements her swordsmanship abilities well. However, her personality conflicts with that of her master, Yuyuko Saigyouji, who is very whimsical and playful in nature. Still, she serves Yuyuko as best as she can, tending to the gardens in Hakugyokurou and following her orders. Youmu commonly wields two blades at once, having studied some under her father, Youki. The longer blade, called Roukanken (Tower-Watching Sword) is said to be able to kill ten ghosts in one swipe; the shorter blade, Hakurouken (White Tower Sword), is able to cleave through a person's own confusion. However, not much is known about her particular style of swordsmanship, or her parents. What is known is that Youki, also a servant of Hakugyokurou, had begun training a very young Youmu when he suddenly disappeared one day, leaving her style incomplete. No one currently knows his whereabouts. (Source: Touhou Wikia)