A Gravity Child that first appear at Trick 227, as an intruder, with Nike and 3 other "new Gravity Children", attacking Kogarasumaru, Falko and John Omaha. Possessing great power, it is assumed by many fans that he's going to be one of the members fighting the Sleeping Forest in the Gram Scale Tournament .He is seen displaying great intelligence in noticing Agito's awareness of him around. He is always seen smoking even in a battle, with acessories and clothings belonging to the 'goth' genre. Gawain controls the Gladius Road. Using an AT with a whip like edged weapon, it is safe to assume that it is a road that injures the opponent like the Bloody Road. The wheels for his ATs are the Ball Roller type,similar to Aeon Clock's AT. It has shown no special abilities, as of yet. It is noticeable that he is extremely fast and athletic, as seen in the Battle of Osaka where he fought Yoshitsune (albeit being repeatedly outwitted). An example is when he slice off Yoshitsune spectacles with his AT blades without making visible motion. (from wikia)
Haruto Sakaki is an 18-year-old Hunter working with the STN-J. He is brash, slightly hot-tempered, ambitious, and supportive. He often rushes into danger during hunts, and this often produces regrettable results. He is the newest member of the group after Robin, and is initially afraid of being replaced when she arrives. Sakaki is not biased about choosing friends however, and welcomes Robin to the crew. As with Amon, Sakaki does not show any superhuman ability. However, he is later hunted by Zaizen, suggesting that Sakaki is an unawakened "seed." He is saved via direct intervention of Robin, Amon, Doujima and Nagira. When that attack on Sakaki fails, they realized that Karasuma is left alone, presumed to be attacked and captured at the same time. He later helps Robin infiltrate the Factory to save Karasuma, and provides covering fire while Michael attempts to get an elevator back online. He is confirmed alive after Factory's collapse, Michael mentions that he still hunts witches at the end of the series.
Robin Sena is a soft-spoken 15-year-old girl with a mysterious origin, given that she has power similar to the witches she helps hunt. She was raised in a convent in Italy before she joined the STN-J. Robin has a fire craft that allow her to manifest varying amounts of fire. In addition, she can channel her energy into shields capable of blocking both solid matter and "crafts." or magical powers, from other craft-users like herself. However, any use of her power causes her eyesight to weaken—which in turn greatly reduces the accuracy and effectiveness of her pyrokinesis. This problem is easily solved by wearing glasses, but Robin does not like to use them—especially when she first gets them. Though good-natured, Robin has employed her gift to the point of lethal force when necessary to either save someone's life or for the good of others.
Takuma Zaizen represents the highest authority of the STN-J. His only superiors are the executives of Solomon Japan and, of course, Solomon Headquarters. Normally, he heads STN-J operations from his office at the STN-J's main building at Ravens Flat. But some time before the story begins, he had created an auxiliary branch of the STN-J, known simply as "The Factory." On the surface, its design and purpose seem simple enough: to research and implement a more humane means to hunt Witches: in other words, to hunt Witches without necessarily killing them. With Zaizen's backing, the Factory came through with an experimental substance called Orbo. This strange green liquid has the ability to absorb and thus dampen Witch powers. It's used in two primary ways. Most of the Hunters wear a pendant containing a vial of Orbo as a defense. Although the pendant dampens any Craft that may be in use (such as Karasuma's scrying), it provides an invaluable means of blocking almost any Witch power directed at them by absorbing the energy and prevents an attack from inflicting bodily harm on the wearer. This defense is limited, however, against a focused Witch power which can bypass or overwhelm the Orbo. Orbo's other use is in offense. The Hunters can carry air guns with special bullets filled with the substance. Fired into a Witch, the Orbo enters the bloodstream and works to dampen the Witch's power and render him/her helpless. Once contained, the Witch can then be restrained, picked up by the Factory, and taken to confinement (Note: None of the Hunters understand the exact nature of this confinement; this will come into play towards the end of the series). There is one problem with Orbo. For reasons unknown, Orbo cannot be safely handled by anyone except those with the Witch Gene. Fortunately, all Hunters are Seeds (unawakened Witches) at the least and so are capable of using Orbo. Robin is the only Hunter who doesn't use Orbo: for personal reasons, claiming it disgusts her. However, even as the series progresses Zaizen is continuing the research into Orbo, hoping to lift that limitation. At the same time, there are rumors that Solomon Headquarters isn't exactly thrilled with this prospect, and this may well lead to disagreement and even open conflict between the branches. Touko (Robin's roommate in the first half of the series) is actually his daughter from a previous marriage (which is why their last names differ).
The main character and protagonist of the story. He suffers from constant nightmares. Nemo is around the age of eight and is a generally sweet boy who loves the circus. However, he has been known to lose his head now and then, such as when the princess makes fun of his pajamas and refers to Icarus as a "little rat." He has been summoned to Slumberland by Professor to be the Princess's playmate and (as he finds out later) the future prince of Slumberland.
A very handsome boy, Nakahara is lonely and serious most of the times, due to having a painful family life. He only starts trusting again when he becomes the best friend of Kojima Yuki. He becomes friendlier and more open to other people and also starts to realize that he deeply loves Kojima.
The king of Slumberland and the Princess's father. He ordered the Professor to bring Nemo to Slumberland to be his daughter's playmate. He shares an interest of trains and machinery with Nemo, who grows very dear to him. The king, in spite of his expected responsibilities, has a habit of sneaking off to his playroom (where he accidentally runs into Nemo who, at the time, wasn't aware of who he was). Morpheus decrees that Nemo is to be trained to be Prince of Slumberland and gives him "The Golden Key" which can gain him access to anywhere in Slumberland (provided Nemo promises not to open the door with the same symbol as the key on it). He gets kidnapped by the Nightmare King at Nemo's coronation, prompting Nemo to set off after him, along with the Princess, Prof. Genius, Icarus, and Flip.