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Opera (オペラ) is a security demon working under Lord Sullivan as well as with Iruma Suzuki. They are often seen preparing and escorting Iruma for school, assisting Lord Sullivan in his work. Opera also lives in the same house in Sullivan's mansion with Iruma, and manages the laundry, cooking, timetabling and transport for the two of them.
Opera has a master-servant relationship with Sullivan as he relies heavily on Opera's abilities and advice to keep him on track and away from distractions. As a security devil, their main priority is to protect their master's life. In addition, Opera is also responsible for protecting Sullivan's status, appearance, and reputation, as well as in any support as they can. After the events of the Akudol Games, Opera accepts their will as Iruma's servant as well.
Opera's rank is currently unknown. Humorously, Opera was Kalego's upperclassman during their tenure at Babyls as students and is the only person who Kalego genuinely seems to fear.
Opera has red hair with a straight cut fringe and a short plait. They have a pair of red, cat-like hairs protruding from their hair, in addition to the second, elf-like pointed ears they possess. They have red eyes, small thick black eyebrows, and a pale complexion. They also have a black, cat-like tail.
They often wear formal attire, particularly a red vest over a white shirt and a striped red and white tie, and navy dress pants.
Opera is androgynous in appearance, with delicate features, slight stature, and a plait but a masculine dress sense, and no otherwise overly feminine features.
Opera has a serious, down-to-earth personality. They often act as a voice of reason for Lord Sullivan, but are usually ignored. They are mostly reserved with their opinion, but will voice the occasional concern or cynical remark, and will sometimes dispense helpful advice.
Their interactions with Naberius Kalego reveal that they have a somewhat more mischievous and sadistic side not normally shown in their professional behavior, which was especially prominent when they were students at Babyls.
Not much is known about Opera's life prior to their enrollment in Babyls Demon School, and in between their graduation to that school and employment to Lord Sullivan.
During Opera's time at Babyls however, Opera had an alias of Mysterious Top Dog of Babyls who is popularly known (although identity-wise, not) to be very violent and brutal towards a second year and third-year students in the school, and beat them up respectively. Kalego was not a huge fan of the name initially as he is often targeted instead because of the same features he had like Opera's, describing the title of a top dog.
Over time, they befriended Kalego, a fellow first-year student, (and in extension, Balam) whom they often teased and bullied.
Babyls Enrollment Arc
Opera is introduced as the competent servant of Lord Sullivan. They are often seen assisting Sullivan with his work, preparing Iruma for school, and taking care of chores. While they are shown to have a close relationship with Sullivan, they seem concerned over his decision to adopt a human grandson.
Cannonball Execution Arc
Opera asks Iruma if he wishes to return to the human world. Iruma is unable to answer the question so Opera explains that, with a high rank, it's still possible to travel to the human world. Eventually, Iruma decides that he wants to raise his rank.
With instructions from Sullivan, Opera helps Iruma train for the Execution Canonball, an activity in which freshmen can rank up. Opera is revealed to have impressive strength, speed, and precision much to Iruma's shock. Their strict training focuses on helping Iruma catch a ball. This proves to be a challenge due to Iruma's overwhelming crisis evasion capability causing him to automatically dodge every ball thrown at him.
Over the course of their training, Opera and Iruma begin to understand each other better. Iruma expresses that he can recognize when Opera is in a good or bad mood depending on what position their kitty ears are in.
After winning the Execution Canonball and being promoted to Beth (2), Iruma ecstatically thanks Opera for their help. They appear to be happy about this but also somewhat embarrassed. From this point on, the two get along better. Opera shows much more confidence in Iruma unlike before.
Division Party Arc
Once the Division Party officially begins, Opera and Sullivan come to spend time with Iruma as a family. With their adept skills, Opera embarks on a winning streak across many different games and attractions set up by various Divisions. Later, Iruma reveals how much he appreciates the two coming to visit him and exclaims that they're a wonderful family.
Royal One Acquisition Arc
Opera and Sullivan welcome Iruma home after he comes back from the student council. They are happy that Iruma has finally returned. The next day, however, Iruma's personality has completely changed and he has seemingly entered his Evil Cycle. Opera is so shocked that they drop their dishes onto the floor. They wonder what could have happened to him.
Along with Sullivan, they are very relieved after Iruma's personality returns back to normal.
First Term Final Exams Arc
When Naberius Kalego pays Iruma's mansion a home visit, it's revealed that Opera was once his classmate and they're close friends. Opera teases Kalego and bosses him around, although it's all in good nature.
Walter Park Arc
Opera, Kalego, and Balam are entrusted by Sullivan to act as chaperones for Iruma and his friends in Walter Park. When the Panther Rat appears, Opera shields Ix Elizabetta, Crocell Kerori, Azazel Ameri, and Valac Clara from its attack. They are able to stop the demonic beast in its tracks just by grabbing its claw. They tell the students to run away and exclaim that protecting those important to Iruma is also their duty. After the children retreat, Opera launches their counterattack, demonstrating their incredible strength and agility. They leap onto one of the beast's tails and deliver a devastating kick to its face. They're so focused on attacking, however, that they're caught off guard by the beast's other tails.
Ameri protects Opera from a hit and explains that, as the student council president, she could not turn her back on a moment of crisis. This amuses Opera. The two decide to team up to fight the Panther Rat, that is, until they notice that Clara returned as well and is dangling from one of the rat's tails.
Ameri aims to fight the rat alone and asks Opera to rescue Clara. She pinpoints the weak spot of the Panther Rat and defends against another one of its blows. Opera is impressed by her reflexes and the control she has over her magic. After rescuing Clara, they continue to observe Ameri's fight from a distance.
After Ameri defeats the Panther Rat on her own, Opera praises Ameri and expresses that she has plenty of room to grow stronger. With piqued interest, they ask Ameri if she would like to work with them as an assistant after her graduation. While Ameri initially declines, she's then realizes that being an assistant would mean she would live with Iruma just like Opera. While extremely flustered, she takes back her rejection and says she will think about it again, much to Opera's confusion.
Opera and Ameri appear to Iruma's side during the fight against the merged demonic beast. Opera expresses that they were able to get there because they followed the scent of Iruma's perfume. Balam asks Opera to team up with him. Opera presents a summoning seal to Iruma, with the intention of getting him to summon Kalego to join them.
Once Kalego is summoned, both Opera and Balam can't help but pet him. Everyone eagerly awaits to see what the three high-ranking demons' battle would look like. Everyone is utterly shocked when the three defeat it in just a single combined hit. However, the Six Fingers cause the defeated demonic beast to turn into a magical bomb. Iruma is able to consume all of the magic and save everyone thanks to his Ring of Gluttony.
Opera reflects on how they often wondered why Sullivan choose to bring Iruma to the demon world. Now, they feel like they understand his decision.
Super Strength: Opera has a great set of arms that are capable to eliminate targets with ease. They were able to destroy the hardest target without any problem and carrying a boulder to strike at the bowling game one point during the Divison Party.
Extreme Precision: Opera has a keen sense of eyesight as they seen able to shoot the middle of the target multiple times splitting their own arrows in half.
Fast Reflexes: Opera is shown to have the ability to maintain a quick movement in distances for a short period of time, as well as being able to jump from one place to another smoothly. Opera is even capable of doing this even if they carry someone with them.
As the demon Opera works under, Opera is very loyal to him. He relies heavily on Opera's abilities. He also trusts them deeply, seeing as they know that illegally entered the human world and brought a human into the demon world. Opera sometimes worries about him and the decisions he makes.
As the human that Sullivan adopted as his grandson, Opera protects and cares for him. Initially, they were wary of Iruma's ability to adapt to the demon world. They were unsure why Sullivan choose Iruma in particular. Over time, however, the two eventually became close enough to consider each other family. Now, Opera shows much more confidence and respect for Iruma. They care a lot about Iruma, wanting to protect him and the people he cares about, and will also get angry at those who talk badly about him. While they can be strict at times, they are often doting on him and want to do whatever they feel is best for him.
Opera was Kalego's upperclassman when they attended Babyls. At the time, Opera would bully Kalego by making him buy bread for them and carry their stuff. Despite their past, Opera claims that they were and still are close friends. When the two are together, they drop their usual composure around each other. Opera becomes much more mischievous and Kalego becomes surprisingly timid. Opera likes to affectionately tease him and boss him around. In response, Kalego either gets intimidated or riled up.
Like Kalego, Opera was also Balam's upperclassman when they were students. Unlike their relationship with Kalego, Opera and Balam act much more mature together.
Despite the various and opposing opinions of fans, no biological sex for Opera has ever been confirmed or even stated in the manga, volume extras, anime, light novel, spinoffs, or BD extras. Osamu Nishi, the author, has never spoken on the matter, and has pointedly ignored questions about Opera's biological sex in several twitter Q&As.
Chapter 186.1 lists the preferred personal pronoun as "they".
Their favorite activity is using beds as trampolines
Once in a while, when they are the only one at home, they sit on Sullivan's throne.