Voice Actress: Carrie Keranen (https://youtu.be/aJXJoPn65_s)

The Cross-Dimensional Observation System No. XX, known as Systemfor short, is the main antagonist of BlazBlue: Cross Tag Battle.

According to Rachel Alucard, she was created by her father Clavis Alucard, from the fragments of Keystones, which splits into four to record any combat datas within each four selected universes through establishing a so-called universal Keystone Scramble Tag tournament, like the spy cameras, unaware to the chosen fighters. Originally, Clavis created her for the purpose of cross-dimensional observation and the creation of new possibilities, but gone haywire to start acting sentient on her own. Once all data has been gathered, she began her true conquest to conquer the universes she selected, then so may the rest of the unseen universes. It was revealed by the time Rachel found this abandoned, she accidentally activates System, and must undo her mistake to shut her down before the latter’s universal invasion begins.

If one data collected Keystone from winning universe is destroyed, just as the fighters of the winning universe obtain the piece of their respective Keystone, all other chosen worlds merge into the former said universe, corrupting the fabric of reality, only the inhabitants of the winning universe regain the memories of the previous cause and knowing what happened with their home universe.