Grigori

Father Grigori is the only known surviving occupant of Ravenholm during the events of Half-Life 2. He appears to be eccentric and possibly mentally unstable, but is generally friendly. In Half-Life 2, he helps Gordon Freeman survive his trip through Ravenholm, granting Freeman permission to use the various traps he has rigged throughout the town, giving Gordon the SPAS-12, and escorting him to the mines on the far side of the zombie infested town.

Personality
Grigori is quite possibly insane and can be heard ranting, uttering various disjointed biblical references and laughing maniacally while hunting zombies in Ravenholm. It is unknown if his laughter and religious references are symptoms of insanity or merely aspects of a dark sense of humor; most likely, they are both. Grigori probably has a form of chronic reactive psychosis, which is not a mental disorder in itself, but psychosis brought on by the experience of a severely traumatic or stressful event.

Grigori appears at various points in Ravenholm, generally standing at a high vantage point from which he proceeds to kill the various zombies in the areas below. Zombies seem to prefer to attack the player when given the choice, except during the final sequence leading up to the mine entrance. Because of the limitations of his weapon, he has to reload frequently, so he is vulnerable to the zombies that can reach his position, such as Fast Zombies, in significant numbers or when operating at ground level.

Like Alyx Vance, Grigori seems to have rapidly regenerating health, making him very hard to kill, so players shouldn't generally need to concern themselves if he is attacked unless the numbers get too large or explosive weapons are used. He will cry out in anguish when he is overwhelmed and requests the support of the player.

He tends only to fire at enemies short to mid-range since his weapon, Annabelle, does not have a scope, so he will often fire while retreating back from a zombie if they reach him. Additionally, while "Annabelle" is very powerful and is capable of killing a zombie in a single shot, it must be reloaded every two shots, thus hindering its usefulness against large groups.

Grigori has also rigged a great number of traps throughout Ravenholm, ranging from spinning blades to flaming pits. These traps are able to be used by the player throughout the town to kill zombies to great effect without expending somewhat rare ammunition.