Season 4 is perhaps the most tame when it comes to violence, with a more stylized approach. The hand-to-hand element is still intense though and there are multiple uses of weapons. Magical elements also come into play, as characters are thrown around and suffocated with such powers. A man is set on fire and characters are stabbed (knives and arrows), shot (arrows and guns) and beaten, with little or no blood.
In a very intense scene, a man has a pen thrown in his eye (a brief blood spurt can be seen when he pulls it out) and another is choked with a wire of sort, resulting in blood flowing down the killer's shirt. The killer later uses the same thrown pen to violently stab the first man (offscreen) to death.
Seasons 1 and 2 are pretty dark when it comes to violence, with frequent action violence. While not very brutal, it can get intense and have bloody results. People are shot with guns, and arrows and stabbed (all result in some blood shown). The action is also very atmospheric, with dimly lit hallways and streets, making the violence all the more intense.
In a hospital fight, a man is shot with guns and an arrow (blood spurts on the wall) and later has his tendons sliced with arrows (not much blood shown).
A man is shot with a submachine gun repeatedly (blood spurts in slow motion, though the scene is brief)
Three people are killed of by a metahuman via their powers (sonic scream). Neither of the kills are shown, but the aftermath is. One is a brief crime scene image, the other is a photograph, while the third is the most disturbing (visible bleeding from the ears and splattered blood on the wall). Another episode sees a man being killed brutally with the same power after he is impaled through the wall (bloody and a little graphic).
A security guard is stabbed in the abdomen (not shown) and drags a blood trail after himself on the ground (disturbing) and later has his neck snapped.
During a very quick and rather bloody fight scene, Deathstroke kills a dozen men, shooting them (blood is seen briefly spurting), bashing them with his guns, tossing them across the room and brutally stabbing and slicing them (impalement is seen in full view with blood). The aftermath has pools of blood near the corpses.
In a duel, a man's hand is cut off (no blood, but the dismemberment is fully shown). Not long after, we get a brief glimpse at the severed hand.
A man has his eye stabbed with an arrow.
A man falls and chunks of glass get stuck in him. He later pulls these off.
A security guard is stabbed in the back and vomits blood.
A woman is stabbed with an arrow. She later dies in a hospital.
A man is shot with several arrows and falls out of a building.
During the beginning of season 7 we see a lot of prison violence.
A man is shot and forced to remove the bullet from his wound.
A woman is shot in the back of the head. We see her body and the wound.
Oliver slices a man's artery (though not graphic).
During a prison break, a couple of prison guards are seen being beaten by a couple of inmates. We see blood on their face and them screaming in pain.
A man is set on fire and falls off of a ledge.
A woman has her neck snapped.
A prison guard has his throat slit and we see the blood.
A man is stabbed through the chest with a sword, and let to fall off a high cliff. He falls on a rock and left for dead.
Oliver is tortured by villain, there is waterboarding, shot with arrows several times. Flashbacks contain Oliver stabbing someone to near death, and also in flashbacks an entire room is almost killed by a gas attack. Overall this is probably the most intense episode.
Not that much violence and no gore. But noticeably more violent then other series like the flash. Since the hood comes out at night, the violence is obscured by dark lighting and rapid camera angle changes
A man is tied with a bomb and explodes. We see a blood bath and graphic remains (is it quite blurry)
Action violence is present in each episode. As the seasons progress the violence & content becomes less dark and starts leaning toward more of what you would expect in a typical comic book movie.
A man sees his father kill himself (offscreen)
A woman is killed by a sword stabbed through her,from the back, this happens while her children view .
The series features frequent martial arts combat. This sometimes includes violent hand-to-hand combat, but injuries are never graphic and only slight blood is shown.
In earlier episodes Green Arrow has killed people via skewering with arrows or combat kills (broken neck), but never any gore or injury is depicted.
A woman is shot with multiple arrows, and then falls off a roof.
In season 3 the violence gets extremely intense and has more blood. Sword fights often have bloody results. A lot of the hand-to-hand combat also gets more intense and becomes more brutal.
In a graphic scene a man pulls blades out of his stitched up arms and neck. He later dies from blood loss. Another man takes these blades and slits a mans throat resulting in blood spray.
Deathstroke cuts off a mans arm the stump is only seen for a second
Oliver tortures a man brutally by slicing down his leg and sticking arrows in his arms