Human-looking silhouette/Relationships

Lyza
Lyza describes in her notes an encounter with a Human-looking silhouette somewhere near the 7th layer. While the silhouette was watching Lyza, she took notice as well and kept an eye on them, until Lyza calls them out and they escape jumping.

Reg
During the battle in Ido Front with Bondrewd, Reg wakes up after overcharging and claims to have been controlled by someone among many people who come to his mind, among them Human-looking silhouette appears implying there may be a connection between them. The silhouette also appears before him in his overcharged state while looking at Bondrewd casuing him to get enraged.