He was Morgan's son who died in the very first episode of Season One.
Noah worked at the hospital where Beth was held captive in Season Five. He escaped with her and joined the group in Alexandria. He was killed on a run with Glenn.
She was Andrea's sister.
Otis was the dude who accidentally shot Carl in Season Two. He was a friend of Hershel and felt horrible about shooting Carl vowing to make it up to Rick & co. by going on a run for medical supplies with Shane. Unfortunately that didn't work out so well for him because Shane sacrificed him to get away.
Officer O'DonnellOfficer O'NeilOfficer O'Connor
It's Officer O'Donnell.
He was a police officer at the hospital where Beth was held captive. Beth ultimately pushes him down an elevator shaft to his death.
Joe was the leader of the Claimers. Rick killed him at the end of season four.
She was the leader of Alexandria.
Axel was a prisoner who joined Rick's group after initially rebelling against them. He was killed by the Governor.
He was one of the Governor's right hand men but left Woodbury to be the leader of a different group of people. The Governor would later throw him into a pit of walkers.
Dr. SubramanianDr. SmithDr. Sharron
He treated everyone that got sick in the prison and then ended up dying because he got sick.
She is one of the first members of Rick's group. She gets blown up along with the CDC in the last episode of Season One.
He was Beth's boyfriend.
Bob was one of the new people at the prison. He got romantically involved with Sasha, got his leg eaten by people at Terminus, and ultimately died.
He was a scientist and fierce ally to the Governor at Woodbury. The governor locked him in a room with Andrea while he was turning and ultimately infecting her.
He was the leader of Terminus.
Karen lived at Woodbury until she eventually deserted the Governor during his attack on the prison. She and Tyrese later become romantically involved until she gets sick and Carol burns the shit out of her.
"Look at the flowers. Look at the flowers."
He had a bow and arrow. It was pretty cool.
Carol also burned the shit out of him.
IT'S SOPHIA SHE WAS IN THE BARN THE WHOLE DAMN TIME.