Best Answer: How Did Android 21 Become a Majin?
Contents Because She Was Made by a Group of Unnamed Scientists (Which Led to a Loss of Memory in Some Parts), These Scientists Slipped in All Sorts of Cells...
Because she was made by a group of unnamed scientists (which led to a loss of memory in some parts), these scientists slipped in all sorts of cells into her body. A good deal of these are Majin Buu’s cells.
How did Android 21 become evil?
Android 21 (Evil) is the evil persona of Android 21 that began manifesting after the cells of Good Buu were added to her. After the cells started going berserk, 21’s hunger grew unstable, driving her mad.
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How old were Android 17 and 18?
Assuming their number designation could be a hint to their approximate age when they were introduced, as they were kidnapped as children, this would make both Android 17 and 18 in their late 20’s or early 30’s by the end of the Dragon Ball Super anime.