Solo is the Lone Soldier (Kokou no Senshi) and sole survivor of Mu. He constantly battles with Rockman in order to obtain his OOPArt - the Sword of Berserk. He has a mysterious power to Denpa-Henkan using his loneliness in order to become Burai - Rockman's nemesis during this season. Burai is formidable with both a sword and with martial arts, making him a very tough foe. Solo was sealed so he could destroy Ra Mu if it was ever resurrected. His true motive for gathering the OOPArts were to keep Ra Mu from ever being reborn. Orihime gathered all three OOPArts and managed to resurrect Ra Mu and Burai - thanks to Rockman's help - was finally able to destroy it. Solo disappeared inside the Mu portal in order to seal Ra Mu.
Soda was once the apprentice of an apothecary named Zantak, but he was so impressed with Argent’s abilities that he decided to become his apprentice instead despite Argent repeatedly telling him no. Soda is an energetic boy determined to find a cure to Argent’s poisonous condition, and frequently joins Argent on his journeys.
The governor of Shuo, a northernmost province constantly in war with northern nomadic nations; mostly notably in this timeline, the Turks. He later died after the capital decided to sacrifice the city - meaning that they will not send soldiers to aid in the city's defense. His head was offered during the city's surrender to the Turks.
Yuusuke is a bubbly and cheerful person, who is popular with the girls and generally well-liked. Much to Shin's chagrin, Yuusuke always has an idiotic grin pasted on his face. Initially, he develops a liking for Maria as she is beautiful and has an intriguing personality. He is the first student to approach her and constantly pops up wherever she is. While he is extremely fond of her, it is not yet revealed if it is more than admiration. It seems as if he knows that Meguro likes Maria, because in chapter 11 he calls Meguro out and tells him that if he doesn't step up he might "steal Maria away". Yuusuke taught Maria the "lovely transform". He calls Shin "Megu-chin" and Maria, "Maria-chi". His face forms a comical style with thick dark outlined eyes and a w-shaped smiled when someone (mainly Kawai) is blatantly against one of his ideas. He also confessed his love to Maria later in the series. (Wikipedia)
The protagonist of the story, Maria has a cold personality which estranges herself from her classmates. She says what she wants, albeit too bluntly and harsh, even when she intends to help others. Her arrogant facade and point blank statements are the reasons she is hated by most people and it seems she too is indifferent towards them. Emphasized throughout the manga, Maria also is shown to have the ability to see the true natures of people around her, or—more simply—their flaws. Although she maintains this air of superiority, she actually yearns for acceptance and friendship. Even when knowing the unpleasant outcomes, she often steps into troublesome situations just to prove herself to others. Everyone thinks that she is a devil but they don't know that they're the devils. She gives special regard to Kanda Yuusuke but exhibits much stronger feelings for Meguro Shin, stating that she feels Shin is much closer to her than God and she is much more afraid of being hated by him. Later she realizes she is in love with him. She likes nursery rhymes and hymns like "Amazing Grace." She apparently got expelled because of "punching the teacher/nun," but it has not been explained in detail, though it was revealed that the cross she always wears is from that teacher/nun. She has a habit of pushing out her lips and having her eyes half open when someone says something that annoys her. It is shown that she starts to like Meguro. (Wikipedia)