Nikolai Delphiki is a major character of the book Ender's Shadow and a side character in Shadow of the Hegemon by Orson Scott Card.
Nikolai is one of twenty-four fertilized eggs produced by Greek natives Elena Delphiki and Julian Delphiki, Sr. A defect in one of Elena's fallopian tube and an ectopic pregnancy in the other made it impossible for her to conceive. In their hopes for a child, Elena had several eggs taken out, and Julian's sperm was harvested to produce numerous fertilized eggs. The healthiest were cloned, and then the twenty-four healthiest of those were chosen. One was implanted, producing Nikolai.
However, a man named Dr. Volescu, the illegitimate son of Julian's father, stole the twenty-three remaining fertilized eggs for use in his experiments involving the modification of a human genome. Volescu later chose to exterminate the babies instead of being discovered, and twenty-two were killed. However, one child escaped, hiding in a toilet tank. The child then was discovered by a janitor, and was later named Bean.
Nikolai was later chosen for Battle School, where he met his (although not known at the time) biological twin brother Bean.
Read more about this topic: List Of Battle School Students, Other Battle School Students