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Baal is the father figure of Apocalypse. Created by Terry Kavanagh and Adam Pollina, the character first appeared in Rise of Apocalypse #1 (August 1996). In ancient Egypt, Baal of the Sandstormers saw En Sabah Nur's potential power and will to survive, believing that only those who are strong enough to survive hardship and direct conflict are worthy of life.

The army of Pharaoh Rama-Tut and General Ozymandias destroy the Sandstormers, but the two are injured and seek refuge in a cave in which Baal reveals the Celestials' advanced technology hidden to his protege before death.

Baal makes a non-speaking appearance in the X-Men: Evolution episode "Dark Horizon".

Baal appears in the X-Men '97 episode "The Rise of Apocalypse", voiced by Michael Dorn.

Nakia Bahadir is a Turkish girl and a friend of Kamala Khan. The character was created by G. Willow Wilson and Adrian Alphona, first appearing in the third volume of Ms. Marvel in 2014.

Nakia Bahadir appears in Ms. Marvel (2022), portrayed by Yasmeen Fletcher. This version is a student at Coles Academic High School.

Bakuto is a ninja in Marvel Comics. The character, created by Andy Diggle, Antony Johnston and Marco Checchetto, first appeared in Daredevil #505 (April 2010).

Bakuto, the head Daimyo of South America, meets with the other four Daimyos in Jigoku-Chu Castle in Japan. He shows some doubt in Matt Murdock leading The Hand and especially scoffs at White Tiger's involvement due to her being a woman. Beforehand, Bakuto killed his master, Izanagi, to showcase "[his] strength of will", even going so far as to not allowing him seppuku.

In the present, while having dinner, Bakuto's food is spiked causing him to hallucinate demons. Matt goes to check on him as Daredevil and are both immediately attacked by ninjas that were secretly sent by the other Daimyos. After defeating them, Matt is led to believe that someone is attempting to take Bakuto's life and ups the security. Despite this Bakuto believes that Matt was the one who sent the ninjas and begins plotting to kill him. He is later confronted by a possessed White Tiger and killed in combat.

Bakuto appears in the Marvel Cinematic Universe series Iron Fist and The Defenders, portrayed by Ramón Rodríguez. This version is one of the leaders of the Hand and Colleen Wing's former sensei.

Balloon Man (Emilio Helio) is a professor who suffered an accident that caused him to only breathe helium. While mocked by his fellow scientists and discovering that he can control gas, Helio became the criminal Balloon Man, using balloons in his criminal activities. Balloon Man takes control of the balloons at the Thanksgiving Day Parade, where he battles Spider-Boy and Squirrel Girl.

Balthazar or Belathauzer in his first appearance, is a demon who has clashed with the Defenders and Devil-Slayer.

Martine Bancroft is an assistant to Michael Morbius and Emil Nikos, whose experiments aim to cure his blood disease. They backfire and turn him into a vampire-like being. After being manipulated by a cult, Bancroft personally assists in finding resources to cure Morbius' "pseudo-vampirism". She is interrupted and ultimately turned into a similar creature before Morbius and Simon Stroud inject her with the cure. After being killed by David Langford, she is resurrected but becomes possessed by the Lilin Parasite of Lilith's group before being saved by Morbius. Bancroft's original personality returns, albeit now as a true undead vampire, and she even has a friendship with Jack Russell / the Werewolf. After becoming a true undead vampire, Bancroft is destroyed by Morbius while saving Peter Parker / Spider-Man.

Martine possessed the typical powers associated with true undead vampires.

Martine Bancroft appears in Morbius (2022), portrayed by Adria Arjona. This version is a scientific colleague of Michael Morbius. She personally assists in the experiment that creates his vampiric form and is later killed by Morbius' adoptive brother Milo. Bancroft is revived as a vampiric creature after unintentionally ingesting some of Morbius' blood.

Elaine Banner or Elaine Walters is the sister of Susan Banner and Brian Banner. During their childhood, all three of them including their mother were physically and mentally abused by their alcoholic father, Bruce Banner. For years they suffered but eventually they pulled through until Bruce died.

Susan, Elaine, and Brian all wanted to move on with their lives but Brian was still suffering from the trauma of their childhood together and would do everything he could to spend as little time with his siblings as possible because he did not want to relive anymore bad memories, straining the relationship between them. Susan married a man by the name of Drake, and Brian ended up marrying Rebecca.

Elaine married Morris Walters, becoming Elaine Walters, and soon after gave birth to their daughter, Jennifer. Morris hoped that Jennifer would become a police officer like him, but Elaine supported her daughter's ambitions to become a professional dancer growing up instead.

Since Morris was the Sheriff of the Los Angeles County Sheriff Department, he came across many enemies, the biggest one being the mobster Nicholas Trask. Trask planned to murder Morris by making his death look like a drunk driving incident, but his plan backfired when Elaine had been the one driving to see Jennifer's dance recital with two of her friends.

Elaine Banner appears in The Incredible Hulk episode "Down Memory Lane".

Elaine Banner appears in She-Hulk: Attorney at Law, portrayed by Tess Kincaid.

Bantam is the name of two characters in Marvel Comics.

Bantam is an assistant of Trevor Fitzroy who uses his power as a chronal anchor to keep track of Fitzroy's time portals. When Fitzroy takes over a future timeline and renames himself the Chronomancer, Bantam accompanies him. Bantam realizes that Fitzroy had been driven mad by his dreams of power, and eventually betrays Fitzroy to the rebellion led by Bishop. Bantam assists in the raising of the gate