Android 21

Android 21 (人造人間21号 'Jinzōningen Nijūichi-Gō') is anAndroid who appears as the main antagonist of Dragon Ball FighterZ when in her evil persona. Her intelligence rivals that of Dr. Gero,[1] though she may be even smarter than he was.

Appearance
Android 21 is described as a busty scientist with glasses and long bushy auburn hair. She has a gold ring on her left middle finger, and black nails. She wears a pair of hoop earrings, a sleeveless, blue and red short dress with black stockings, black arm sleeves, and blue and red heel boots. Her eyes are similar to that of Dr. Gero's Androids, such as Android 18.

In her true form, Android 21's skin turns pink, her ears pointed, her eyes red with black sclera and gains a tail. Her attire changes to a black tube top, keeping the black arm sleeves, and also gaining white baggy pants. It's noted that she mostly resembles a Majin in this form.

Her appearance in her true form is the result of her having all of the traits of the Z Fighters, Frieza, Cell and Majin Buu rolled into one.

Personality
Due to her biology Android 21 has a natural, compulsive instinct to feed (which grew out of control due to cells in her body going berserk). Like Majin Buu she prefers sweets and confectioneries, her favorite being macarons. However, she has no control over her hunger and constantly fights to keep herself from turning others into treats and devouring them.

Her hunger is so great and painful that it has led to Android 21's psyche being damaged and manifesting a split personality. The longer she goes without feeding, the more the evil side of her gains control. When her true persona is in control she acts like a kind and motherly woman who was concerned about Android 18 and agreed to help her. When her evil persona is in control however, she becomes a sadistic and power-hungry sociopath, wanting to "devour" all the powerful fighters, drawing to the point of near insanity. Her gluttonous lust for "devouring" powerful fighters is similar to the traits of the Majins, inherited when Buu's cells were added to her. She is friendly towards the good Majin Buu.

When split into good and evil halves, her good half seems to be incredibly apologetic, even apologizing as she attacks mid-fight, and chooses to work with the heroes to fix her wrongdoings. As such, her good self was willing to sacrifice herself in order to help stop her evil self, much to Android 18's reluctance, while also thanking the soul in her for everything it had done for her. In the same setting, Android 21 was shown to trust 18, passing on the soul to her. In spite of this, she is still ravaged by her hunger and has a natural desire to eat her allies, leading 21 to fear herself.