There are a lot of characters where we don't off if they are death or not (or it depends on your choice if you know their fate or not) i am talking about:
Glenn ( who was last seen driving off seeking his family)
Lily (left behind on the road or drove off in the camper with fuel for 30 miles)
Molly (ran away from the zombies and wasn't seen after that)
Christa and Omid (last seen on the rooftops in Savannah)
Kenny (tried to save ben or christa in the alley but was closed in by zombies. Telltale said that we discover kenny's fate in season 2)
Do you think someone will return?