A flashback shot where a woman's dead body is seen lying on top of her daughter is displayed occasionally throughout the series. The mother is covered in blood and bullet wounds in her body are clearly visible, although they are blacked out.
The violence in the show is not overly graphic and there is no dismemberment or gore. However, it can be very bloody, and the overall body count is extremely high, with several of the deaths involving citizens.
Set during an ongoing war, the show has both fantasy and real-world violence (mecha battles, guns, chemical warfare). Lelouch uses special powers to control other people, often making them commit deadly violence toward themselves or others. Combat is intense and graphic. Children and innocent citizens are killed off-screen; you can hear crying, followed by gunshots and silence.
The main character(Lelouch vi Britannia) orders a group of soldiers to die by using his Geass, and they all commit suicide by shooting themselves in the head.
A young man (using Geass) tells several men to kill themselves, and they all shoot themselves in the head.
There are many scenes in which people are gunned down by large mechanic robots, with some blood seen. There are also many mecha fights and the people operating them are sometimes killed (albeit bloodlessly).