The Undead is a class in Disgaea 5: Alliance of Vengeance. A living corpse that wanders the netherworld cemetery in search of others to eat . Continues to live by devouring others. Their Evility Predation lets their HP recover by 10% each time they attack.
The Zombie is a decent early-to-midgame Monster specializing in HP, ATK, and DEF. With high stats in the aforementioned categories, the Zombie makes a decent decoy for enemy attacks, and are very good at dispatching low-level units thanks to Predation. Their only flaw is their abyssmal MV. This makes them vulnerable to consistent assaults, and their low SPD makes evasion a non-option. While they are eventually outclassed by stronger monsters, their Evilities make them very self-reliant so Healers won't have to micromanage them very often.
They are essentially utility attackers that, if put in the right circumstances, take care of themselves.
“An undead creature that consumes others' life force.”
—Short in-game description
“Dead bodies who were revived by the miasma of the Netherworlds. They are categorized as a race, but they technically aren't a race. Because of their smell, they are generally hated, but they do have a cult following. Most are weak, but some are as strong as Overlords.”