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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 from 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 classmate 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 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.
Overtime, they befriended Kalego, a fellow first-year student, (and in extension, Balam) whom they often teased and bullied.
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.