These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Genius Bonus: apparently, the MAGI's operating system is a hybrid of Windows and Linux.
The author happens to study computer programming and is not above putting in some jargon here and there.
Mary Sue: subverted with Kaworu. While at first he appears to score pretty high on a Mary Sue litmus test, it's quickly revealed that he has his own problems. His Leeroy Jenkins tendencies and Chaotic Good alignment are in no way portrayed in a positive light.