Kirito:
Kazuto Kirigaya, also known as 'Kirito', is an extraordinary person. So extraordinary in fact, he is actually an extraordinary extraordinary person. Very few people could boast about doing such a varied amount of things throughout their life as Kirito.
A published theoretical physics paper has claimed to have found the source of Kirito's so-called 'harem powers'. They named this burgeoning phenomenon: "Quantum Harem Magnetism". This theory, led by Dr. Hoshiyama (who also published papers on: 'The Connections Between Suburbs and Wooden Cabinets, and 'Mathematical Models of Tokyo Commuters on Fridays') proposes there exists massless particles called 'Attractrons'. 'Attractrons' are said to be produced at a constant rate from various living organisms as a waste product of cellular processes. These particles, when entering another body, promote the release of dopamine and norepinephrine, which makes a person feel more attracted to another. Every person produces different amounts of Attractrons, depending on both genetics and metabolism. However, it is claimed in this paper that Kirito produces a dangerously high and unnatural amount, leading to many to be attracted to him, and thus them being a part of his harem. Though uncertain how common this case is, there is a belief that such high amounts of Attractrons being emitted from male teenagers has been on the rise in the first quarter of the 21st century. The reasoning is currently unknown but the paper's authors hope to discover the causes of before any major consequences occur due to 'Quantum Harem Magnetism'. Sceptics of this paper argue the proposed funding and resources for this new field should be invested into designing the next generation of the Source Game Engine instead.
Yui:
The Mental Health Counseling Program 001 (or Yui-MHCP001 for short, or just Yui) is a top-down Artificial Intelligence program developed by Argus to address mental health concerns of the Sword Art Online player base, it was first of its kind. However, a full trial was never able to be conducted due to the SAO incident, which many view as a bad move.
Why Yui was developed alongside and made exclusive for Sword Art Online remains a mystery as such a Counselling Program would have more potential than developing a Zero Altitude Space Exploration Craft to explore the inner solar system according to several professors stuck in the 1970s.
It should be remarked that no one should attempt to adopt a Mental Health Counseling Program unless that individual fulfils these very particular requirements, in ascending order of importance:
1 - The person is trapped within a Mass Multiplayer Online Death Game
2 - The person remains alive within said Death Game until the latter floors
3 - The person has not been associated with any guild for most of their time within said Death Game
4 - The person has 'married' within said Death Game
5 - The person is Kirito or Asuna
Klein:
Mostly harmless.
Alice Zuberg:
The Artificial Labile Intelligent Cybernated Existence, or ALICE for short, is the first Highly Adaptive Bottom-up Artificial Intelligence and is said to be the result of a years long project which remains highly classified.
How Alice was created, and how she came to be, remain a mystery. However, this mystery has not prevented countless theories from being sprung. One popular theory is that Alice was supposed to be the basis of the next generation of military AI, leading to an era of 'the war economy' that starts to create a self-replicating system that profits more and more off constant conflicts. However, this theory has many critics. These critics point out two particular areas: first, Alice has emotions, which contradicts the ideal AI for warfare; and secondarily the distinct lack of nanomachines, which are reportedly vital in making a global war economy.
