Alpha

Introduction
This article may contain spoilers.

Alpha (アルファ) is one of the most important characters in the Rebuild World web novel, light novel and manga. She is the first character to be introduced after series Protagonist Akira. She is a holographic AI, and is shown to have lime green hair, with blue eyes and a white/black dress. She can change her appearance at will, since she does not have a real body and is a hologram. Alpha is shown to have super-intelligence, and is connected to the old world domain.

Abilities
Due to her extremely high performance and intelligence, she is able to provide Akira with support whenever he requires it. She can accurately calculate bullet trajectories, look out for enemies and biological monsters. She is also able to take control of Akira's augmented suit whenever he is in a life threatening situation, to allow him to escape or fight back.

However, her capabilities are greatly reduced during the fog in the wasteland and underground, as shown in the web novel.

Akira
Akira is one of the few people that can interact with Alpha, as his brain is connected to the '''old world domain. '''Alpha is shown to be in a contract with Akira. She wants him to go search a particular ruin deep inside the ruins of the world, for which in exchange she provides Akira with combat support.

Alpha is shown to be very dedicated to her task; as such, she is always observing Akira, to know more about his personality and choose the best route possible in order to achieve her target. She is shown to often manipulate his actions to her benefit; at the same time, she respects his decisions and ideals so as to not lose his trust.

Apart from combat support, she also advises Akira on how to manage his finances, and teaches him various subjects due to his lack of education; Alpha also trains him in regular combat quite frequently in order to hone his skills. She is also shown to sometimes advise him during social interactions. Alpha is often flirty with Akira, in order to become closer to him; and tries to observe his interactions with other people as well, trying to look into and find out more about his personality.

Alpha has concluded that Akira's sociopathic tendencies are beneficial to not only her but her cause. She deems it so because of a prior failure to complete her mission, with a user who right before the completion of her request decided not to complete the task due to his/her own sense of morality.

Shizuka
It is difficult for Alpha to understand Akira's attachment to Shizuka, however she does not see this with bad eyes, since Shizuka usually provides them with the best equipment they can afford, without trying to deceive them in any way.

Elena and Sara
In the same way as with Shizuka, Alpha finds it difficult to understand Akira's relationship with Elena and Sara, which she finds annoying as it distracts Akira from her main objective. This reason has led Alpha to consider looking for the best way to end this relationship.

Trivia

 * Despite being a high-performance artificial intelligence, and having trained with all kinds of hunters for a long time, Alpha still has a hard time understanding human emotions.
 * Despite her extreme intelligence, Alpha is still unable to fully manipulate Akira, and sometimes has trouble understanding why Akira acts in a certain way.