Byakku Shiki (白式 - literal translation is 'Type White')
Byakku Shiki is the personal IS of Orimura Ichika, developed by Japanese Government.
Although initially estimated as 3rd Gen IS test-type, it is later revealed that Byakku Shiki is (at least partially) a 4th Gen. conceptual IS. it was originally designed with the goal of utilizing One Off ability without having to proceed to 2nd Form, but it was discarded when a serious defect was discovered, rendering the IS inoperable.
Sinonono Tabane then acquired it through unknown route, and apparently fixed the defect. She also further customized Byakku Shiki by installing experimental Fold-Out armor on its weapon, Yukihira Type2, using it as a 4th Gen. IS test bed.
The basic armament (officially called Preset) of BS is a Yukihira Type2, a blade designed for CQC. It is later revealed that Yukihira Type2 is at least partially equipped with Fold-Out apparatus, a prototype of Fold-Out armor which is the prominent characteristic of 4th Gen. IS.
※ Yukihira is the name of similar blade Chihuyu used in the past.
Since 4th Gen. IS utilizes all available slots in order to be initially equipped with One Off ability, it is incapable of utilizing Equalizer.
Byakku Shiki is equipped with One Off ability named Reiraku Byakkuya(零落白夜 - a rough literal translation being 'white night of downfall')
This ability enables Byakku Shiki a special attribute - It could negate the effect of anything consist of energy (the kinds that does not have physical body.)
The most important point is that by activating this ability, Byakku Shiki can completely bypass the opponent's IS shield. Since the attack would not be weakened by IS shield (which is the key defense in every IS) a single direct it is often enough to force opposing IS to activate Absolute Barrier, effectively rendering it energy-depleted.
However, this ability does not come without a heavy cost. Activation of this ability requires vast amount of energy (which is much more than an IS can continuously supply) so in order to maintain the ability, additional energy has to be converted from its own shield.
When activated, Fold-Out apparatus opens up on Yukihira Type2, producing an energy-field with One Off attribute superimposed on the physical blade.
Since the Fold-Out armor in Byakku Shiki was installed when the technology was still in experimental stage, it does not benefit from the full capability of Fold-Out armor, and its application is limited to offensive role only.
Byakku Shiki is also capable of executing Ignition Boost, a high velocity charge which is usually followed by critical blow from One Off enabled Yukihira Type2.
When activated, the exhaust from thruster is absorbed inside a nozzle chamber and pressurized before being released, enabling a sudden burst of speed.