Imitator

Imitator (物真似師) was the Unique Skill of Veyron. He manifested this skill due to his ordeal of dealing with whatever his master desired.

Abilities
It allows the user to turn into anybody that they have seen. It is a far more precise ability in comparison to Marco's Unique Skill Adapter, which is similar in function.

Trivia

 * During his fight with Marco, Veyron tried to imitate Rimuru, but Ciel intervened by blocking the attempt and upgrading his skill instead.