Fin Fennec

Fin Fennec is the locked room instructor at BLUE and the world's expert on locked room studies. She is one of the few people in the world who holds a S-rank detective license. With her "Phoenix touch" ability, she has found 5,000 hidden rooms, 3,000 illegal constructions, and 10,000 tricks of physics so far. (Source: Ron Kamonohashi: Deranged Detective Wiki)