Invincible Detective

Lexicon Entry
A mysterious individual who successfully fled from the Secret Police's experiments. Believed to possess unique powers, they were given the alias "Invincible Detective" after they managed to survive every test imaginable.

However, because experiments were always conducted on groups of five, Invincible's identity remained unclear.

As researchers cautiously investigated the true nature of this peculiar ability in a way that would not inadvertently kill the child, their oversights allowed Invincible and the rest of their group to escape the facility.

(Invincible is assumed to have determined that if their identity were pinpointed, everyone's lives would end up at risk.)

Ever since, "Invincible Detective" has been used as a general term to refer to the escaped child subjects. Though great efforts have been made to track them down, not even one has been found as of yet.