Throughout Fables, Boy Blue is depicted as a young man in his mid-to-late teens with blue eyes and blond hair. In Fabletown, he has his hair cut short and wears modern clothes in his signature color. He usually has a modern, valved trumpet of some kind on or near his person. He wears Chuck Taylor All-Stars.
In flashbacks, notably "The Last Castle," Boy Blue is shown as a medieval squire or page in blue livery, with hair that touches his shoulders.
During "Homelands," Blue, when not transformed or in disguise, is drawn with a blue cloth mask tied over his hair and the top half of his face, matching the dark blue color of the Witching Cloak. He carries a blowing horn. When Blue takes the shape of an animal for travel or concealment, the color blue usually remains prominent in some way: he is shown once as a mouse with a blue traveling cloak and repeatedly as a bird with blue feathers. It is not revealed whether this is because of Blue's affinity for the color or an inherent trait of the Witching Cloak - though it should be noted that the Witching Cloak was only blue while Boy Blue was in its possession (it was violet in "The Last Castle" and grey in "The Dark Ages").
Boy Blue's backstory as a fighter against the Adversary's forces is revealed in "The Last Castle" as Blue tells Snow White the story of the Fables who defended the last open gate to the mundane world. This is at the tail end of the Adversary's campaign against the European fables, with most of them having either already escaped to the mundane world or been enslaved or killed.
Blue fights with Colonel Bearskin's Free Company, eventually becoming the colonel's aide-de-camp. As of "The Last Castle," Blue has survived several battles: "Boxen, , Oakcourt, and the hellish rout at Hollyfield", among others. His last battle is a defense of the castle guarding the last portal to the mundane world. A ragtag force, including Robin Hood and his Miry Men, hold the fort while a single ship ferries as many refugees as possible to the new world.
The day before the battle, a woman claiming to be Red Riding Hood rides into the fort nearly dead from arrow wounds. She and Blue quickly became infatuated with each other, to the extent that she suggests that Friar Tuck should marry them so that Blue will be allotted a seat on the last ship out. Citing his duty, he refuses. Arriving for battle in the morning, he learns his new orders: he will observe the battle from a high parapet and, at the appropriate time, will use a powerful but poorly understood item known as the Witching Cloak to teleport himself to the ship with the message that the last defenders have fallen and they are on their own. Fabletown will need to know what happened, Bearskin tells him, but he also sees this as a way for Blue and Riding Hood to be together. Unfortunately, when Blue arrives on the ship, he discovers that Riding Hood is not there. He is told that, not wanting to live without him, she had given up her spot to a stranger and stayed behind.
The readers first meet Boy Blue during "Legends in Exile," in which he's shown as Snow White's office gofer and clerk. He is one of the few people who can get Bufkin, the flying monkey who serves as Fabletown's librarian, to do his work. Blue is one of Fabletown's most skilled musicians; he takes his horn with him everywhere. He will occasionally try to get gigs in Harlem jazz and blues clubs, but is always told that he is too young, too white or "too hayseed". His roommate is Pinocchio; the two of them, along with Flycatcher are best friends. Blue seems to live a typical "nerdy" lifestyle, avidly reading comic books and playing board games.
Blue's life changes in "March of the Wooden Soldiers," in which Red Riding Hood suddenly appears in Fabletown, claiming to have recently escaped the Adversary. She is initially angry at Blue, claiming that he had abandoned her to the Adversary's forces. However, she soon seeks him out and says she was sorry and wanted to resume their relationship. After a sexual encounter, he realizes that she is not the Riding Hood he remembers. The readers then learn that she is actually Baba Yaga using Red's form as a mystical disguise. Along with three wooden soldiers, she interrogates Blue for several days, breaking all his fingers, before having the soldiers deliver him, along with a message from the Adversary, to the Woodlands business office.
Against Snow's objections, Blue has Dr. Swineheart patch him up and bind the Vorpal Sword to his hands so that he can fight in the Battle of Fabletown. In the street-level battle, Blue is injured by gunfire. Afterward, Dr. Swineheart continues to rehabilitate Blue and he eventually regains full use of his hands.
Return to the Homelands
After Pinocchio is dismembered during "The March of the Wooden Soldiers," Blue leaves for the Homelands, taking the Vorpal Sword, the Witching Cloak and Pinocchio's puppet body. Most of Blue's exploits there are detailed in "Homelands." The Witching Cloak acts as Blue's impregnable armor; it cannot not be burned, stretched or ripped; it provides endless personal carrying capacity, and it allows a large degree of shape-shifting. Blue spends some time killing the Empire's soldiers, impersonating at least one governor (ordering his underlings to lower tax rates), killing at least one dragon, and working his way toward the capital. While in Rus, the Homeland corresponding to real-world , he kills three knights that are magically connected to Baba Yaga; the fact that their decapitated heads keep talking alerts Blue to the fact that she is still alive and a prisoner of Fabletown.
During the Emperor's bimonthly public address, Blue impersonates a peasant. This gets him close enough to decapitate the Emperor, which the readers then learn is only a large puppet, like the wooden soldiers who'd attacked Fabletown. The Snow Queen encases Blue in a block of ice, trapping him. He wakes up without any of his magical equipment, imprisoned in Geppetto's cabin. He offers Geppetto, who still holds some affection for his first-carved son, Pinocchio's body to revive in exchange for two demands and one request: The full story behind the Empire's rise, an audience with the real Red Riding Hood and a chance to speak to Pinocchio after his revival, respectively. When Red Riding Hood arrives, Blue discovers that woman he had met during "The Last Castle" was, like Baba Yaga, an impostor and spy. The true Red Riding Hood has never met him before. A heartbroken Blue calls the Witching Cloak to him, slays Geppetto's guards, and escapes back to Fabletown. Pinocchio, again intact but now under a loyalty spell to Geppetto, does not come with him. Blue does bring along the true Riding Hood, whom he feels is no longer safe in Geppetto's lands.
Although the Fabletown community believes that Blue had stolen the Vorpal Sword and Witching Cloak, the readers learn that Blue had been on a mission from Prince Charming and has used the Witching Cloak's infinite storage space to store books from every library he'd come across. He brings Fabletown hundreds of volumes containing valuable maps and intelligence. Unfortunately, Charming is unwilling to make this knowledge public, so Blue has to stand trial. He is sentenced to two years of hard labor at the Farm. Rose Red, the Farm's administrator, considers him a hero and takes a very loose interpretation of "hard labor."
Blue leads the construction of Bigby's house in and serves as Bigby's best man when he marries Snow. Blue nurtures romantic feelings for Rose.
During "War and Pieces," which tells of the war to reclaim the Homelands, Blue is given the job of transporting back and forth from numerous points to act as messenger and delivery boy to the Fables' strongpoints; Glory, , Fabletown, Wolf Manor, the Farm, Haven, and the hotspot in the center of the Empire where Briar Rose is stationed.
Everything runs smoothly until the Empire makes a final attempt to shift the tide. Blue is at when a Korta Vulma Urso arrow is shot at Bigby. Blue throws his arm up, covered in the Witching Cloak, but the arrow punches through far enough to scratch Bigby's neck. The effects of the arrow caused both Blue and Bigby to be knocked out for a number of days. Upon awakening, Blue keeps what is left of the arrow sticking in his arm. Even wounded, he continues to use the Witching Cloak to retrieve and deliver weapons. He ultimately uses the Vorpal Sword to chop the head off the Emperor. Later, he, along with Pinocchio, retrieves Geppetto and brings him to Fabletown.
Convalescence and death
During the aftermath of the war, Doctor Swinehart removes the remainder of the arrow. Despite this, an infection sets in, causing Blue greater discomfort than before. These complications are later revealed to be caused by a minute thread of the Witching Cloak still lodged in Blue's arm, a problem possibly exacerbated by Mr. Dark casting his unbinding spell on the cloak before the thread is removed. Swineheart eventually amputates Blue's arm at the elbow.
Boy Blue's condition continues to worsen despite both Frau Totenkinder and Doctor Swineheart's best efforts. After the collapse of Fabletown, he is moved with the other refugees to the Farm, where Flycatcher attempts, unsuccessfully, to counteract Blue's condition. On Blue's deathbed, Rose Red immediately divorces her husband Sinbad. And tries to marry Boy Blue before he died, but Blue turns her down. He Calmly and sternly points out that really she's attracted to those who offer the most excitment, good or bad. And that its too late for her, because he's realized he deserves better than her. He apologizes that she was broken but he's not the one for her and that he can't fix her. He did hope someday, someone will. This would later affect Rose deeply, though its obvious no one else knew he rejected her.
Blue requests that he be buried on a hill overlooking a baseball field rather than with the other war dead to reflect his lifelong preference for a quiet life over heroics.
Some of Blue's friends wonder whether he will return from the dead, as some Fables do. Pinocchio and Flycatcher conclude that, since Blue is only known to the mundanes in one nursery rhyme, it is unlikely that he will be able to come back soon or even at all. Nevertheless, Rose Red resolves to become a better person, someone worthy of Blue, by the time he returns, though this could because she's too shattered by his rejection. (As of issue 98, she has finally recovered from her sickbed with this dedication in mind and reunited the Fable community, which was in turmoil due to conflicts involving Geppetto's rights as a citizen of Fabletown.)
After Blue's death, the non-human Farm Fables, particularly Stinky the Badger, elevate Blue to quasi-religious status, wearing blue scarves as signs of their devotion. Stinky preaches with great conviction that Blue will one day return to usher in an age of great peace and equality. When Jack Horner returns to the farm during "The Great Fables Crossover," Stinky and some others mistake him for the returning Blue in disguise. Jack is quick to take advantage of the situation.
Clara notes with unease that Stinky's eyes, formerly brown, have turned blue, however later on his eyes do seem to have returned to normal. Though Blue's return may not ever happen because as Flycatcher concluded they had to accept the fact that Boy Blue is dead. And he may never return. Stink would be proven wrong, Boy Blue has yet to come back and although Mr. Dark was defeated, it wasn't by Blue. It was by Mr. North who sacrificed his freedom and life for his family. Though despite that, Stinky still believed Boy Blue came back, but he missed it.
Boy Blue did reappear in All In A Single Night, a sort of Christmas Carol where Rose Red met him, along with the Little Matchstick girl and the False Bride. His spirit claims she must learn how to restore him back to life.
Relationship to the Witching Cloak
In "The Last Castle," Blue's commanding officer hands him the Witching Cloak so that he can fulfill a messenger mission. At that time, the characters know only a little about the cloak's powers. In a later chapter, Blue remarks that if he had known then what he later learned about the cloak's capabilities, he could have won the entire battle single-handedly.
In the last pages of "March of the Wooden Soldiers," the readers are informed that Blue has been practicing and experimenting with the Witching Cloak for several centuries: Prince Charming requests that the cloak be brought to him and he discovers that Blue has taken it and run off. In this scene, the readers are informed that many of the powerful magical items brought to Fabletown by the fleeing refugees had been assigned to Fabletown citizens who had been deemed capable of experimenting with them and figuring out how they work in case they are ever needed for the town's defense. Charming is informed that the Witching Cloak, although technically Fabletown property, had been assigned to Boy Blue.
During "Homelands," Blue is shown as adept at using the cloak for disguise, storage, concealment and protection. At one point, he uses the fireproof cloak to tie a dragon's mouth shut so that it will explode and die. He also uses simple voice commands to either call the cloak to him from a short distance away or set it to self-destruct with all its contents. Blue eventually dies as a result of a tiny thread of the Witching Cloak becoming lodged inside an arrow wound in his arm, preventing it from healing. The thread is still there when Mr. Dark casts his unraveling spell to reclaim the cloak's powers.
The Witching Cloak is drawn pink in "The Last Castle," but at all other times it is drawn in some shade of blue. As of "The Great Fables Crossover," no in-universe explanation has been given for this as either a genuine change in the cloak's appearance or a continuity oversight. In "Witches", it could be speculated that the cloak was dark because it used to be the boogeyman's bag (and part of himself, as well).