Botkin Yul-Erdene was the instructor for combat training classes at the Little Palace.
He was a former Shu Han mercenary who had fought in multiple wars on every continent. He fought for anyone that could afford to pay him. He was said to have a gift for killing no matter the method, and could and would train anyone. He was shown to favor his own people, but since "the Shu had a bad habit of taking a scalpel to their Grisha, few made it to the Little Palace to join the Second Army." The Darkling recruited him to teach Grisha to fight without their powers.
Shadow and Bone
Botkin taught Alina to fight better, making her run many drills throughout the palace grounds. He was friends with Zoya, calling her a star pupil, until she used her powers against Alina in a fight, which was forbidden.
Siege and Storm
Botkin stayed at the Little Palace after the Darkling's coup and later on throughout the book. He continued teaching Grisha, including the Fabrikators after Alina added them to combat training. He did not seem to have any problem with Alina's changes. Later, Alina sent Botkin with the Grisha students to Keramzin, which she hoped would be safer than the Little Palace.
Ruin and Rising
She yelled at the Darkling that she hoped Botkin killed twenty, even hundreds of the Darkling's Grisha. The Darkling simply said that Botkin was an extraordinary man.
Botkin had a scar across his neck and straggly hair. He had dark hair and golden eyes.
Personality and traits
He loved weapons and fighting.