If you mean the people silhouettes, the 3 people who know the real value of Rosickle are :.
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1. Rykell Cyclamen / King of the North
(transcendental of the North, the ruler of the forest and wasteland in northern territory. Maybelle's father, Galatea's husband). That's why he know that the magic staff got stolen.
2. Raul Crepundia / Duke of the West
(Transcendental of the West, the ruler of the prairie and hills in western territory. Galatea's bestfriend and Rykell's rival. Maybelle rescued his nephew and the children become a very good friends). He is the owner of the big woody marionette in episode 17
3. Margot Paranelly
(Transcendental of the East, ruler of the ruins and volcanoes in eastern territory, she is Galatea's disciple and dislikes Rykell, especially after her mentor dead. She act like a doting aunt to Maybelle)
The 4th transcendental is already dead
4. Galatea / High Priestess of the South, Guardian of the Tree of Life
(transcendental of the south, ruler of the forest in the southern territory. Maybelle's mother. Her territory became a deadly swamp and the location of illegal black magic experiment in the empire after her death. Rykell plans to raid this area while Maybelle (now 18 y.o in the novel) entred the imperial academy to study and look for a way to revive the tree of life.
The 7 monarch wizard didn't make their appearance yet.

Okay who was those people hiding? AHAHAHA I love this thank you for working hard on translating this take care.