During Ensemble Stars!'s initial release, only three members od the oddballs (Wataru, Rei, and Kanata) were revealed, and they were known among the students as the "Three Oddballs." The other two oddballs were known by students to be "in hiding." With the advent of Marionette and Element, Shu and Natsume respectively returned to the public eye. In Aquarium, Rei notes that the three oddballs are characterized by their impassioned love for other people; the remaining two are naturally more distanced from people, and have more complicated feelings toward other humans.
In addition to being skilled in idol-related activities, the Five Oddballs all seem to have their own field of specialty in which they excel related to their backstories:
- In Crossroad, it was revealed Rei's charismatic air (his personality, looks, and general demeanor) naturally draws people to him, who worshiped him akin to a God ever since he was a very young child. They would beg him to solve their problems, and, despite his young age, Rei wore himself out trying to do everything that was asked of him. As a result, Rei became a quick learner in order to fulfill any request. Eventually, people grew entitled to Rei's aid and scorned him when he could not be there for everyone at once. This quick learning is what later made others call him a "genius." His motivation to aid others steps from his love for all people, and a fear of being left behind due to his vampiric medical condition, which prevented him from being active during the daytime. Eichi likened him to Tsukuyomi, god of the moon, and one of the three Shinto deities believed to have formed ancient Japan.
- In Phantom Thieves VS Detectives, it is revealed that Wataru was orphaned as an infant and taken in by a kindly old couple. In order to repay their goodwill and the kindness of the world around him, Wataru became an expert performer and magician to bring smiles and laughter to everyone around him. Eventually, he became so quirky in his attempt to entertain others that people no longer were able to understand him. This exceptional skill in performance and magic is what later made others call him a "genius." His motivation to entertain others stems from his love of others, but, because of his flair for performance (considered obnoxious by others), he now hides his true feelings and instead plays supporting roles for the people around him, both on and off stage. Eichi likened him to Amaterasu, goddess of the sun, and one of the three Shinto deities believed to have formed ancient Japan. Of the three, Amaterasu is historically viewed with the most esteem and worship.
- In Meteor Impact, it is shown Kanata is regarded as a living god by the believers of his religion. Kanata comes from a long line of living gods who exist to quell calamity should it ever return. Kanata was raised to believe he truly is a God and that he can grant the wishes of those around him. Because the Shinkai compound is located underwater, Kanata also came to believe he is a fish and that he can communicate with marine life. Though considered unusual before considered a genius, Kanata does have exceptional talent in singing and excels as an idol, like the other oddballs, and marine animals do appear to be fond of him. Though he understands now that he is not a god, his motivation to help others stems from his love of others, and for a desire to understand other people better. Eichi likened him to Susano'o, god of the sea, and one of the three Shinto deities believed to have formed ancient Japan.
- In Victoria, it is shown that, as a child, Shu preferred the company of dolls as he always felt isolated from his peers, who bullied him, and strict family, who frequently scolded him. He instead confided in Mademoiselle as his closest friend. Once his peers and other families learned of his penchant to speak to Mademoiselle as if she were alive, the bullying simply worsened. Shu refused to give Mademoiselle up, and soon began to loathe how puberty changed his body from something youthful and doll-like to something mature and unpleasant to his sensibilities. He soon became obsessed with the flawless, youthful beauty of dolls and dedicated himself to dolls and their aesthetic. This, combined with his exceptional skill in sewing (learned from Kuro Kiryu's mother, as noted in Nocturne), Shu became known for his "genius" in that he was not only a master of the aesthetic arts, but a brilliant tailor.
- In Pleiades Night, it was shown that Natsume has always adored his mother, a fortune-teller who guides those who are lost to the right path, and that he follows in her footsteps. He's already well-known as a fortune-teller in his own right; so much that his fortune-telling work rivals his idol work. This, combined with his exceptional skill as an idol (as noted in Element, he was the most talented student in the idol school run by Tsumugi Aoba's mother), sometimes causes others to consider him a "genius." However, unlike the other oddballs, Natsume does not come from a past of particular hardship, nor is he known for his talent to the same extent as the other oddballs (see below for the game's reasoning behind this).
In regards to Natsume's role as a member of the Five Oddballs:
During the war era, Keito came up with the "Three Oddballs" plan and suggests (off-screen, in Black Tea) that Eichi utilize three eccentric students to gain the support of the student body; Eichi decided to expand the count to five. In Element, Eichi and Tsumugi determined fairly quickly that Wataru, Rei, Shu, and Kanata should be part of the Oddballs. However, Eichi believed that adding a member from the first year students would suit his plans better. Natsume was therefore added only to round out numbers, and was not Eichi's first choice; he was considered alongside individuals like Subaru and Hokuto.
Similarly, while the four other oddballs were treated as the public enemies of ex-fine, these four hid Natsume from the public eye so that he would be spared from the same public humiliation. Thus, while Natsume is officially an oddball, and the other students in the past and present knew him as one, he was not socially executed in the same way. And, while the other four oddballs do respect Natsume, they refer to him as their younger brother whom they must protect, rather than a same-age peer.
As a result, Natsume has a complex over being the "odd one out" of the Oddballs (expressed in a variety of stories, such as Eccentric). However, the other four state they treasure him just as much as everyone else in the Five Oddballs.