Eru's childhood friend. He learned magic from Eru when they were children, and he has grown in power and combat ability ever since. Adi is his twin sister.

A Japanese mecha otaku dies in a car accident and his soul is reincarnated into another world as Ernesti Echevarria. Eru inherits memories and interests from his previous life, and aims to be a pilot of a Silhouette Knight, a large humanoid weapon that really exists in his world. (Source: Anime News Network)

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A mecha otaku is reincarnated into another world as Ernesti Echevalier, also known as Eru. In this world exists a huge humanoid weapons known as Silhouette Knights. Dreaming of piloting those robots, Eru, with childhood friends, Archid and Adeltrud Walter, aim to become Knight Runners, pilots of these Silhouette Knights.

Kurata Tsubasa is not your average citizen. Sure, he's a genius programmer and software engineer, but as far as he's concerned, his most important trait is that he's a hardcore mecha nerd. So, what happens when you take that nerd and reincarnate him into a fantastic world of swords and sorcery? Well, you'd think he'd be disappointed...but this world has magical giant robots!
 
Obviously, Tsubasa—reborn as Ernesti Echevalier—now wants to devote his life entirely to these wondrous pieces of technology. But how exactly can young Ernie achieve his ultimate goal of getting his very own mech? He'll have to rely on his imagination, uninhibited by the common sense of this new world, as well as his extreme dedication and focus! He also might just find help in the form of a rather interesting quirk...
 
(Source: J-Novel Club)

Archid Walter