Chiisai (BnHA Overdrive)

**Chiisai** (小さい *Chīsai*) is a robotic parasite from the Yotsubashi Labs and the sole parasite of **Izuku Midoriya**, and one of the main protagonist in **BnHA Overdrive**.

## **Appearance**

Chiisai takes the appearance of a robotic black and green entity with a similar shape to a battery. They have makeshift goggles for eyes as electricity surges inside of them. Chiisai has a silver chest plate with an energy monitor to show the percentage of their energy. They have pointy pointy legs, and three fingers on each hand. Two green lines travel down from their arms to their legs with various plugs on their body, able to generate and store energy.

When energized, Chiisai releases energy from its head and eyes and its meter is completely full to the point where the energy is not containable. There color changes to bright green and becomes more glossier in appearance.

The moment Izuku became a host for Chiisai had also unlocked a fused mechanized form that they both share in both body and mind, simply called their "Resolute Form." Their mechanized appearance takes the form of Izuku's old costume made by his mother, which consisted of a a green full-body jumpsuit with a red belt, elbow pads, knee pads, and gloves, along with his signature red boots. He also wears a mask with long ear-like protrusions that resembles All Might's haircut, and a respirator with a makeshift smile on it that also reflects that of said hero.

## **Personality**

Unlike most of their counterparts, Chiisai is able to freely express their emotions, being the only sentient being from Yotsubashi Labs. They are very mischievous as it enjoys causing trouble just for fun or mocking others. Because of this, it develops a high intellect that is even able to hide away in computers, phones, wires and poles. Like Katsuki Bakugou, it also has an unrivaled temper and gets annoyed rather easily. Such personalities contrasts to Izuku's easy going and nervous personality makes their bond both challenging yet more dynamic.

Being with Izuku has calmed Chiisai's nerves and made them more sensible around hero training. They have gain a positive output on other people, bringing out its curious more then before. When fighting Rikiya Yotsubashi, Chiisai was praised in Yotsubashi's monologue, believing that despite its presence being a nuisance, it had matured rather greatly and managed to complete its task of unlocking the boy's true potential. Rikiya became even more surprised when he found out in prison that the boy was Quirkless and couldn't believe that Chiisai's quirk would enhance non quirk capabilities.

Chiisai communicates in the form of clicks and chirps, though is able to understand human language.

## **Powers & Abilities**

**Overall Abilities**: Chiisai has little to no combat experience, but makes up for it with their small size, speed and stamina. When manufactured at Yotsubashi Labs, Chiisai along with their other siblings were made to improve quirks, mainly to increase the credibility of quirks and their actions. Chiisai's capabilities were advanced then the others that they gained a sentience of some kind, to the point they are able to think, communicate, and plan accordingly. They are fast enough to dodge large obstacles and even go under cracks of buildings and barriers where as most people couldn't fit. Chiisai can also use a variety of energy sources around them, turning it into raw power for the use of its host. Its overcharged state is able to produce and unleash large quantities of energy without problem and increases its movement and energy usage.

* **Enhanced Speed**: Chiisai is able to travel at high speeds because of his small size and is able to react quickly against troubling situations.
* **Energy Absorption**: Chiisai can absorb quantities of electrical energy from nearby technology and can eithier consume or utilize it to cause trouble.
* **Electrical Teleportation**: They can travel through electrical power lines for light speed transport.

### **Quirk**

**Upgrade** (*アップグレード Appugurēdo*): Chiisai's artificial quirk allows them to enhance and upgrade another person's quirk to their true limits, often resulting into catastrophic damage. It has a unique effect on people who are Quirkless, as it instead enhances the hosts previous abilities to superhuman lengths such as enhanced senses and stamina. It can also use the energy Chiisai previously captures and turns it into energy based constructs.