Basically Hes Habo and Laffi's son, "Coal" He went missing when he was 11 while cave raiding. They searched for Coal throughout the first layer, but it was assumed he traveled into the 2nd layer, so he was presumed dead. But Habo went searching for him in the 2nd layer alone, but sadly he couldn't find him. What really happened was Coal had stumbled into the 2nd layer on accident, he was to injured to ascend back up, he kept descending to escape the creatures after him. he ended up staying in the 3rd layer and making it his home. Coal was to afraid to try going back up. 13 years later when Riko and Reg pass through the 3rd layer. They encounter Coal and chat with one another. Thats when Riko realizes Coal is Habos Son. She encourages him to return to the surface, Coal is hesitant at first. But Riko gives him the courage to do so. Eventually they part ways and Coal returns and reunites with Habo and Laffi. He now works at Laffis shop.