Hablog

Habolg (called Habo-san by Riko and the other children) is a well-known Black Whistle and was the person who delivered Lyza's White Whistle and final notes to the surface.

Description
He is a tall and bulky man. He has rather rough, curvy facial features and a beard that connects with his hair. He wears a hat with a lamp on it, similar to mine workers, a large brown coat and a dark brownish west below it.

Personality
Habolg is a very bright and kind person with a rather high level of curiosity, as is seen when he first meets Reg.

Plot
Habolg is one of the delvers sent after Riko and Reg when they had fled the orphanage and had delved into the Abyss alone. He caught up quickly, partly because he wanted to give respects to the "Supreme Treasure of the Netherworld", Reg, about whom he had known because Nat and Shiggy told him. Instead of taking them back to Orth, he offered to escort them to the Seeker Camp; they declined. He then gave Riko a warning about Ozen, some medicine, and other supplies, and let them go.

Since then, while he has not interacted directly with Riko nor Reg, he has been shown on the surface telling stories to Nat and Shiggy about the Abyss and its inhabitants, foreshadowing the dangers that Reg and Riko would face.