A healer is a requirement of any good Disgaea team, as a player's characters will require healing on some of the larger maps when enemy numbers are far greater than the player's, during long trips into the Item World, and to heal status problems, which frees up a player's inventory from HP-healing items.
Since the healer is the only starting class that has a semi-good proficiency in Bows, some players like to initially equip their male or female cleric with a Bow to unlock the Archer class, and also to earn some Mana. Once the archer is unlocked, players will often switch weapons to the Staff, which the healers are much more proficient with, and also create a |Mage or Skullpupil for the healer so the healer can also learn offensive magic.
Note that the Male Healer has higher Aptitudes in ATK and HIT than his Female Counterpart, but has even weaker HP and DEF than she does. They are both equal in INT power, though.
Male Healers should be kept at Long-Range at all times, attacking with Bows or Offensive Magic while supporting allies with Healing spells. Muscles can be given to a Healer, allowing them to eat more attacks, ensuring survival against high-level enemies.