I believe the first person Ender killed was Stilson. He was the bully in Ender's school before Ender went to the battle school.
Ender kills Bonzo on page 259 in the book "Ender's Game" by Orson Scott Card.
Ender kills Bonzo in Chapter 14 of "Ender's Game" by Orson Scott Card. This incident occurs during their confrontation in the shower room at Battle School.
Ender kills off all the buggers and regrets it. Becomes the Speaker for the Dead in response.
Kurou Otoharada
The Bugger egg is the last surviving member of the Bugger race (also known as Formics) after Ender unwittingly commits xenocide and kills off the entire race. So the egg is that race's last hope. Plus, Ender, being guilty about what he's done, carries the egg as a sort of redemption.
Admirial Kendal Ozzel
Well, there is bullying directed toward Ender from Ender's brother, and from kids at school, and from kids in battle school. Ender defends himself and kills two people. Both of the deaths are accidental, but are very violent on purpose. Ender knows that if he only lightly wounds either enemy that they will turn around and hurt him again... so much that his life would be in danger. There is a lot of violence against aliens as well, although Ender doesn't know that it is real. He is just trying to win the game.
When a person intentionally kills themselves, it is called suicide.
it's suigetsu actually...he is the first person that will follow sasuke when he kills orochimaru...more info in narutopedia
The only person Romeo kills is Tybalt.
Antinous is the first suitor Odysseus kills.
It's the narrator's son.