Acid

**Acid** (アシッド, *Ashiddo*?) (real name unknown) is a member of Blue Blood and Counselor's twin sister.

## Appearance

Acid looks identical to her twin Counselor; a short girl with silver hair tied in a ponytail, wearing a baggy dress shirt and leather boots, with her bare legs shown.

## Personality

Like her sister, Acid displays childlike traits and exhibits sadistic behavior. She is loyal to Sakibasu Ryouu and is very obedient to her. Being twins, Acid is almost never seen without Counselor by her side and both of them often talk in unison with one another.

## Background

The school they went to was a bottom-rung institute for hopeless cases, and should never have produced a Level 4 esper (much less two). Consequently, the staff were so desperate for the prestige brought by having them as students that they contrived to make sure the pair could never be transferred anywhere else. They did this by spreading rumours and falsifying records to claim Acid and Counsellor were violent, immoral delinquents. As a result, the two girls became pariahs with no hope of being accepted anywhere else.

## Chronology

### Toaru Kagaku no Railgun SS3

*Main article: Toaru Kagaku no Railgun SS3*
Acid and Counselor accompanied Sakibasu Ryouu to the building holding the corporate server of Zero-Day Link, and were tasked with preventing anyone from passing while she infected the server with Blue Blood's virus. They fought against Misaka Mikoto, Shokuhou Misaki, Shirai Kuroko and Hokaze Junko, and caused the group some trouble together, but were eventually defeated. After the fight, the two were bound and gagged before being put into random lockers.

## Abilities

Acid is a Level 4 esper whose esper ability is based around manipulating oxygen. Acid doesn't gather this oxygen from her surroundings, she produces oxygen in her lungs and breaths it out into the air to control it. She can use this power to produce a gust of wind, blast the enemy with compressed air, alter the concentration of oxygen in the air such as that any kind of spark will create flames, create mirages by bending light, etc. However, since her esper power manipulates oxygen, not air or wind which is a mixture of various gasses, this indirect manipulation of air is not an effective use of her powers. She instead excels at chemical reactions.

Acid can use her ability to combine oxygen with hydrogen ions and air moisture to create a powerful oxyacid, using wind to scatter a rain of acid drops towards the enemy. If suddenly mixed with a lot of water, the acid produces white chemical smoke that damages the lungs if breathed. Although reduced in concentration, the water contaminated with the oxyacid can still hurt those that touch it. Acid can use her control over oxygen to avoid this acid. She is skilled enough at controlling her oxyacid to specifically target the joints connecting various materials and weak parts that support a structure, causing it to collapse under its own weight.

Furthermore, Acid can also combine a collection of various oxydes with the nitrogen and carbon in the air to create muddy-colored solid boxy blocks out of thin air, for example, to build a staircase to the next floor after making a hole in the ceiling. Moreover, she can even breath in enough oxygen to cause hyperventilation under normal circumstances and then control the flow of oxygen in her body down to the cellular level to place her body under her full control. This allows her to enhance her body to near superhuman levels, both in terms of strength, speed and durability, as shown during her clash with Hokaze Junko, when she took in a great deal of oxygen into her lungs and then displayed a boost in strength in a similar way to her enemy's Rampage Dress.