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Bela Dimitrescu was a mutant human resident to Castle Dimitrescu, who lived in the castle with Alcina Dimitrescu and two other mutants whom she regarded as "sisters", Daniela and Cassandra. Bela was the oldest daughter and she was noted to be quiet but with a strong head on her shoulders.
At some point during or prior to the 1950s, Bela was 'created' by Alcina after her body was exposed to a mutant species of insect. The resulting effects gifted Bela with a youthful appearance, the ability to dissipate into the insects at will, and a thirst for human blood. She and her sisters would often enact their sadistic tendencies on staff and visitors alike, having strict requirements about their living conditions and seemed to have a particular preference to blood from men.
When Ethan Winters wandered into Castle Dimitrescu looking for his daughter, Bela and her sisters brought him before their mother with the intent to consume his flesh once Mother Miranda was informed of his capture. Ethan was able to escape and the three sisters then began to pursue him through the castle.
Bela eventually cornered Ethan near the Kitchen, but a break in the window glass allowed the cold air to rush in and severely weaken her. Despite her attempts to kill him, Ethan emerged victorious and Bela quickly calcified into dust. When Alcina later discovered what had happened to her daughter, Ethan could hear her cry out in rage from within her private chambers.
Bela, along with her sisters, were mutant humans born from masses of an unknown species of mutant insects resembling blowfies. These flies are born through the Cadou laying its eggs on a host, though the insect themselves cannot reproduce. After being exposed to the host's flesh, the flies will consume it over the course of days and cover the body in the swarm. During this time, the flies begin to mimic the human form, capable of changing their colors create the desired look, similarly to a chameleon's chromatophore. In this way, the flies are capable of swarming or morphing themselves to form the likeness of a human, similarly to the Mimicry Marcus.
Being made out of the insects, Bela is able to dissipate into the swarm at will in order to move around the castle at very high speeds. She is unable to be hurt in this state as the multitude of insects either absorb or deflect any attacks put towards her. However, the insects that make up Bela's body are notably weak against sudden drops in temperature, especially below 10°C (50°F). Exposure to such cold causes a drastic decrease in metabolism, eventually resulting in dormant, cryptobiotic state which leaves them vulnerable to attacks from conventional weapons.
Bela appears only in the basement of the castle after Ethan falls down there trying to escape from Cassandra. She pursues him through the different chambers, inflicting persistent damage from swarm she is a part of when she gets too close. If she gets within range, she can lunge towards Ethan and bite at his neck. She cannot be harmed and must simply be fled from.
When Ethan fights against Bela just outside the Kitchen, her exposure to the cold severely weakens her strength. Unable to transform into the swarm, she resorts to instead using her sickle weapon in a mad frenzy to kill Ethan, but is able to be hurt by Ethan's arsenal.
- Bela's character is inspired by the so-called "Brides of Dracula" in Bram Stoker's Dracula. These women are vampires who live with Count Dracula at his castle as part of his pseudo-family. In the novel they are eager to both seduce and consume Jonathan Harker and have to be silenced by the Count himself, who instead presents them with an infant for sustenance.
- Bela's name may be a reference to Bela Lugosi, who played Dracula in the Universal Dracula films.
- Bela can be identified by her blonde hair and the red pendant she wears on her neck.