Broo, like any other ordinary Brood, was given birth to by the Queen Mother in space. Because he was born with kindness, an emotion that the majority of Brood are not born with, his kin proposed that they kill him, but the Queen Mother argued with them, as their species was dwindling, allowing him to grow into an intelligent offspring. It wasn't until shortly after his discovery that he was cut-off from the hive-mind leaving him free-willed to do as he wished. He is much like No-Name, Hulk's friend from the Warbound.
Broo was created by writer Christos Gage and artist Juan Bobillo and made his first ever appearance in Astonishing X-Men #40 in September 2011. He is the second Brood alien in the whole of the Marvel Universe to not be part of the hive-mind. His name wasn't revealed till Wolverine and the X-Men #1.
Broo started off as a normal independent Brood but is now enrolled into the Jean Grey School For Higher Learning.
Major Story Arcs
Whilst on a mission in space to eliminate the Brood, Abigail Brand mentions to the X-Men that there's a Brood that was left behind in the ship's laboratory. The other Brood had noticed its sense of compassion and abandoned it because it was an abomination to them. With the help of Abigail Brand's temporary Brood abilities they managed to find Broo in a containment chamber. Broo asked if the X-Men had come to kill him. Storm assured him that they were going to take him home.
As the X-Men were about to leave, a Brood Queen Mother attacks, releasing a poisonous gas which fast-tracks the Brood larvae that were already in them, leaving Kitty Pryde the only one unaffected. The Queen Mother then tries to stop them but Broo stops her by hitting one of her Brood henchmen rendering him unconscious. He then confronts the Queen Mother on her cruel act of keeping him alone and tells her that he is not one of them. However the Brood had the upper hand so Kitty, Broo and Lockheed ran. The Queen Mother and her Brood quickly gain on them, however as the Queen arrives with the rest of her Brood, they are met only by Broo who tells them that Kitty and Lockheed didn't trust him and that they had already left and called for help. The Queen quickly sees through his lie just as Kitty and Lockheed return and the X-Men begin to regain their minds and the tide of battle turns to the X-Men's favor. The X-Men fight through the Brood but Colossus notices that one of the Brood Mothers has got hold of Broo, Storm quickly fights her off with a strike of lightning and defends Broo. He then notices that the strike of lightning released him from the Hive-Mind. A new way of living for Broo had begun.
As the battle waged on, the Brood realized that their Queens were all dead and so they quickly retreated. Later, Storm explains to Broo how he is never alone no matter what his doubts may be. She also tells him of the new awakening Brood in the pods and how he and the future Brood will be closer than ever. He still doubts that they will ever be like him, not with them still having the Hive-Mind, but she assures him that if something did go wrong the X-Men would be more than happy to take him in.
Given the fall-out of Schism and Storm's assurance that he would be part of the X-Men, Broo enrolls in the Jean Grey School For Higher Learning. On his first day, Hellion and Glob Herman come across Broo and begin to tease him about his Brood origins. Wolverine and Kitty Pryde quickly come to his rescue to ease the situation, though Broo tells them that the occurrence would not cloud his judgment of the school. Later on during the inspector's transformations into monsters with the added Frankenstein's monsters assault on the school, Broo joins the fight against them and during that time he meets Idie Okonkwo. Broo and Idie quickly become friends and he falls head over heels for her. Later on, Broo and Idie, while continuing the fight against the teachers-turned monsters and Frankenstein's men, meet an arrogant Quentin Quire followed by an excited Kid Gladiator who both provide good help against the teachers and the Frankenstein's men.
Later on, Quentin manages to find a way to get the assault under control by getting into the mind of the school grounds which were now alive. Even though the school had to undergo more construction due to the attack, the students all went back their normal lesson schedules.
When headmistress Kitty Pride appeared to be pregnant with a kind of brood virus that Professor Xanto Starblood had created, it was revealed that Broo is an exceptional kind of brood who was born with kindness. This causes Xanto Starblood to believe that Broo must be killed. When Kitty Pride defended Broo, he went mad and attacked Xanto in a berserker state. Broo, suddenly seeing that he was covered in blood, then realized what he had done. He realized then that he must face his natural killer instinct and learn how to control it.
It's a new school term for the Broo and the other students at the Jean Grey School For Higher Learning, which means new students will be arriving. As the new students get settled in, Broo welcomes Genesis into the class as well as the school, at that, Kid Omega as usual, makes a rude remark which results in an argument between the two, as it usually does. Later on, Deathlok of Uncanny X-Force guest lectures with Kitty Pryde and tells a few students about their possible futures. Deathlok tells Broo that in the next few years there is a 22.3% probability that a the cure for cancer will be found. He then adds that during the same time there is 34.7% probability that he, Broo, will consume at least four of his classmates. Broo is intrigued, as well as shocked by the whole revelation.
The next day, Beast and a couple of the other students, including Glob Herman, took a trip into Toads human body as a science expedition. Broo was the most intrigued and asked for to have his picture taken near the nucleotides. During all this, Kid Omega tried to flirt with Idie, much to Broo's annoyance, and quickly got involved in order to thwart the little plans that Quentin had as Broo still has strong feelings for Idie.
Later on, Kitty Pryde finds that her belly resembles that of a woman who is 8-9 months pregnant. Beast later discovers that Kitty isn't pregnant with a normal baby, but rather that a swarm of brood have made a nest inside Kitty's belly and will soon kill her. This "pregnancy" made Kitty extremely ill while the other X-Men were figuring out a way to help her. With that going on, Husk sounded a school alert and ordered all the students to immediately head for the panic room to stay safe, yet Broo was hesitant to go. Idie then found Broo in the hallway laying on the floor, saying that he could hear "them" in his head.
As the battle for Kitty Pryde's health continued, Broo is still in the hallway saying "No...But these are my friends...Please don't kill them". Unbeknownst to them, those weren't the only Broo running rampant, the school was then infiltrated by Professor Xanto Starblood, an alien zoologist. While Kitty was on the hospital bed, Broo went in search of her. Much to her surprise, Broo then jumped on her belly and listened to it and then confirmed that there were indeed Brood inside her belly but that those were not the ones he was looking for. Then, suddenly, rogue Brood storm into the hospital room and the duo try to make their escape as they rogue Brood attack them. Kitty then realizes that this was putting Broo in danger, and so takes matters into her own hands. Kitty uses the controls of the Danger Room and places Broo inside a shield even though he tries to fight his way through it. Kitty then attempts to go up against Xanto but falls unconscious, Xanto then clearly states that Kitty wasn't his target, Broo was. Broo, not aware of Xanto's presence, calls out to Kitty but get's no reply, then, out of no where, Xanto apprehends him.
With Broo now in his clutches, Xanto then attempts to kill him, but Broo stalls by asking him why he wishes him dead. Xanto then explains that Broo's kind nature is now a Universally known fact and that Broo, by not conforming to the normal behavioral traits of a normal Brood, was single-handedly disrupting the universal order. Broo then states that he hadn't planned on doing so. Kitty then regains consciousness and with the help of the Bamfs she teleports over to Broo to defend him. The Bamfs then help Broo and teleport Xanto out of the school. Even Krakoa helps out , but Xanto still manages to return as his prime objective is to kill Broo,.Kitty then tells Broo to go to the panic room but he insists that he is not leaving without her, Xanto then punches Kitty out of the way which enrages Broo to a great extent. In anger, he jumps onto Xanto and starts tearing and biting, all the while screaming "DIE DIE DIE ! KILL YOU ! EAT YOU !". While this was happening, the other X-Men were vomited out of Kitty's system. Beast then called out to Broo, calmed him down from his berserker rage against Xanto and took him away.
Broo, coming back to his senses, how and why he was covered in blood. At the same time, while going back to Abigail Brand's ship, Abigail asks Xanto if this whole thing worth it. Xanto replies "yes" in that the rumor about Broo appeared to be false, that though he was indeed more eloquent then his untamed brethren, deep down inside he was all Brood. Hearing this conversation, Broo withdrew from everyone while looking at his blood stained Doctors Robe.
Avengers VS X-Men
During the clash between the X-Men and the Avengers, while Tony Stark, Beast, and Iron Fist were arguing over what to do about the Phoenix problem, Broo begins typing on a computer in order to propose a solution and some insight into what is actually going on. This fills Beast with pride, amazes Iron Man, and confuses Iron Fist.
Broo has the same abilities as any other ordinary Brood, though a more obvious trait would be his uncanny degree of intellect.