MB

"I was not wrong. The humans were foolish and I was forced to bring Judgement on them. And yet because of you...I failed. You must understand the weight of your crime. You must pay for the price for what you've done."-MB to Madeline and Samus

MB, also known as her nickname Melissa Bergman, is the main antagonist of Metroid: Other M.

sTORY
MB was introduced when she saw Samus seeing Maurice's corpse. When Samus saw her, MB was frightened and runs away. She was seen once again and was frightened again, but Samus tried to convince her. Then, MB and Samus were attacked by a soilder using a RB176 Ferrocrusher, but were separated too soon.

Later, Samus meets her again, but MB runs away again. Samus, once again, convinces her that she means no harm. MB opens the door and calls herself "Madeline Bergman". The two had a long conversation about Sector Zero and its Metroids. Samus was still curious about this.

At Room MW, Samus finds another survivor, who is the "true" Madeline Bergman. Samus was shocked and confused and tells Madeline she already met someone with that name. After Madeline shows her ID, she tells Samus that the person she met was MB, and the two talk about MB's story. Suddenly, MB appears and Samus was about to shoot her, until Madeline stops Samus and walks to MB, despite Samus telling her to step back. Madeline tries to convince MB, but MB refuses all of Madeline's words. Then, she was frozen by one of the soilders with a freeze gun. MB managed to get unfrozen and sends all the monsters she planned to send in her story. However, after Samus kills all the monsters, the soilders shoot at MB, and she was killed.

aPPEARANCE
MB is a young woman with blonde hair with a pin Madeline gave to her in her past in the left side and blue eyes.

Trivia

 * As Madeline suggests, MB originally didn't have a human form. But when the scientists began creating Metroids, she was given a human form to help create a maternal connection to the creatures.
 * Her nickname, "Melissa Bergman", was given by Madeline herself, to help make her feel more human.