Bolt Crank is the best "explorer" in the world. "Explorer" in the manga is a kind of mercenary. Although mercenaries in the manga do any job, even assassinations, the explorers were employees with principles. Bolt has a bizarre power, the ability to eat anything and then later recreate it (even fixing the item ingested) from any part of his body. The item usually comes out from his arms and hands, but sometimes can be created in other body areas, like his head, chest, or legs. In the manga, it was revealed that inside Bolt's body was actually a void of space. Objects that he has consumed float around in a seemingly endless space, much like the inside of Doraemon's fourth-dimensional pocket. He is a man of few words and doesn't show his feelings. Always acting cool, his cynical personality and his "always get the job done" attitude can make him seem like a very cold and dark character. But in the end, he always finds a way to do the right thing. He never appears to look back at the past, never regretting it. Although Bolt's past remained a mystery in all the series, some stories gave clues about his past, including some characters that appeared in various episodes. In the end of the manga series revealed a lot about who and what Bolt is, but his exact identity still remains a mystery. Here are some hints in the series: Bolt never ages, but the end of the manga series revealed that he is not an immortal (he may be hurt and killed). The series suggests he had been created before the beginning of mankind. In a story about the downfall of two old winged races before mankind arrived, there is a prophecy about a "man that eats anything" that will be the guardian of mankind until the end of times. There is a character identical to Bolt called Leon. His creations include an android woman (Stella) with human feelings who loved him (an antagonist of Bolt in various episodes, trying to transform all living things in machines) and a weird robot capable of assimilating any mechanical part (it has a parasitic relationship with Bolt and keeps annoying him in various episodes from inside his body). It is implied that Bolt is his clone, or he is a clone from Bolt. Other possible origins are shown in other stories, where Bolt "worked" in a research center that performed tests with human beings and created humans with odd powers, like an immortal woman (with instant regeneration), a girl that turns into a monster, and another girl that generates electricity. Bolt's job there remained unexplained, suggesting he was just another test subject.