Roaming Enemy

An enemy which appears randomly, with no specific point (save one or two to introduce them). Typically takes the form of an Elite Mook which is dangerous early on but much less so when they are encountered later in the game. Comes in several flavours which may overlap with one another;


 * 1) The Wanderer: Patrols a specific area in the game. They may actively stalk the player or they might just move randomly until they find them. Distinguished in that the player may never even meet them.
 * 2) Schrodinger's Encounter: The player will always encounter the enemy - it's just a matter of when. The point at which they turn up is fixed but decided randomly from several potential points ahead of time (typically when the game begins). Distinguished from The Wanderer in that the player won't be able to avoid them.
 * 3) Triggered Encounter: This often takes the form of a boss or Boss in Mook Clothing. It appears only if the player acts in a very specific manner. A specific version of this is Stalked by the Bell, where the enemy appears if the player lingers too long in one area.
 * 4) Fake Roamer: The game pretends that this enemy is actively stalking you or wandering around but it really turns up at specific points in the game. You can identify it by the fact that it always turns up in the same place no matter how many times you play that part of the game.

See also: Random Encounters and Preexisting Encounters which tend to always be used for less unique enemies.

Type 1

 * In .hack//G.U., the Doppelganger, which is a shadowy copy of the party leader (in the player's case, Haseo) that is always 8 levels higher than the player (unless you are at the volume's max level), wanders the area you are in by warping around, but only in fields. One turns up in the field if you don't fight for a certain amount of time, or if you use the keyword "Moonlight", which ensures that there is a Doppelganger in that field. You can run around the field and never find him, or he may be right next to your starting point. Doppelganger can be quite a terrifying opponent, whether or not you actuallly encounter him. If he finds you, the screen begins to flash red and scary music plays as he stalks towards you; if he doesn't, one can get the feeling of being watched.
 * Several areas in World of Warcraft have overpowered enemies patrolling them as type 1. The most infamous example is the Sons Of Arugal, level 20 elites that patrol an area used by players of levels 10-19.
 * The most well-known, however, are the Devilsaurs in Un'goro Crater. Because they become visible at the same effective range as other monsters despite being fifty feet tall, they have gained a reputation for having taken Ninja levels. See also the That One Boss and Boss in Mook Clothing entries.
 * The game also uses type 3 a lot, where specific enemies will only appear if you are on a particular quest.
 * All of the mini-bosses in La Tale, much to the dismay of lower-leveled players killing mooks on the same map.
 * The ghosts in Pac-Man also count as type 1 (at least in some versions), as they move randomly but chase the player if they see them.
 * Pac-man Ghost AI - The cool thing about the Pac-Man ghosts, and what it's rare for the clones to pull off (even if they go for deterministic rather than random ghost movement), is that each had a separate AI which, while all of them were simple, the result was that they made for a very effective team. http://www.atariage.com/forums/index.php?showtopic=68707 has some details, as it turns out.
 * Raikou, Entei, and Suicune from Pokémon Gold/Silver/Crystal. They are encountered like any other random Pokemon but the area they appear in changes. Unusually for this trope the player is generally the one who tracks them down (and they have a habit of fleeing before you can catch them when they're encountered).
 * If Raikou/Entei/Suicune count, then Latios and Latias (from Ruby, Sapphire & Emerald), Mesprit and Cresselia (from Diamond & Pearl), and Articuno, Zapdos, and Moltres (only in Platinum) should also count.
 * They do. The games and manuals specifically call them "roaming pokemon". Also from the remakes: Raikou, Entei or Suicune (whichever beats the one you chose at the start) in Fire Red & Leaf Green; and Raikou and Entei (but not Suicune anymore) and Latios or Latias in Heart Gold & Soul Silver.
 * The latest variation are Thundurus and Tornadus, who wander randomly through Unova, one in each version. They're less annoying than their predecessors, since they cause freak rainstorms on whatever map they happen to be inhabiting, and that tends to call attention to them, even from NPCs.
 * Deathguise / Death Gaze in Final Fantasy VI will spawn in a random area - triggerable only by airship - once you hit the World of Ruin. The annoying parts about this being that it's invisible on the map and prone to running.
 * This is recreated with Ultima Weapon in Final Fantasy VII. You can at least chase him down, since he's visible on the world map.
 * Omega and Omega Mk. II from Final Fantasy V always roam the same room randomly. Not a problem when there's only one of them to run past—a definite problem in the Bonus Dungeon where an entire floor is filled with roaming Omegas.
 * A few of the Dragons from Final Fantasy VI will also roam their lairs, such as the Red, Holy, Blue, and Ice Dragons.
 * In the Pirates of the Caribbean video game (spiritual successor to Sea Dogs) the Black Pearl would roam around the world map, and you could rarely find it as a kind of Easter Egg. Oddly, it doesn't become hostile unless you attack it.
 * Spore has the Epic creatures. These are extremely large versions of otherwise "normal" creatures from the game's library, and are particularly dangerous. They spend their time roaming around the map and killing wildlife, but will turn their attention to you if you get too close.
 * Etrian Odyssey. Even in a boss fight! F.O.E.!
 * Dungeon of Doom had the Wandering Eye, an eyeball with arms, legs and a sword who could turn up at any point in the game. All other monsters were confined to a limited range of levels.
 * Earthbound Uses this system, and will even give players or enemies first attack if one "tags" the other from behind.
 * The Ultimate Chimera from Mother3 is an example of a Type 4. Appears in only two places (the second appearance is practically a Giant Space Flea From Nowhere example), and touching it is an instant Game Over. And if it sees you, it will chase you down.
 * The Spider Droid in the original Space Quest, and the security droids on board the Deltaur.
 * The Droid of Death in the starting area of Space Quest IV can either be a random or triggered encounter. If the wandering cyborg summons it, or if triggered by picking up the Unstable Ordnance after coming out of the sewers, there's no escape. Near the end of the game, there's the Imperial Probe Droid-style sentry bots.
 * The robots in Descent, particularly in the first game, start doing this a certain amount of time after the level starts. Especially dangerous if those enemies are Demonic Spiders, and the level has alot of intersecting passageways. Oh, and later levels come equipped with Mook Makers specifically for this purpose.
 * Twilight Heroes has both Types 1 and 2 - Type 1 in the Static Villains, who appear every so often but only in a specific area, and Type 2 in Wandering Villains, who may appear in any area (but at the same rate as the Static Villains). Both types are optional, and their appearance can be turned on or off by a choice adventure.
 * The use of Respawning Enemies for this is crucial to keep the player from feeling entirely “safe” in horror games, respawning ammo and health optional. Obvious examples include Alone in the Dark and System Shock.

Type 2

 * All the enemies in Left 4 Dead and its sequel fit type 2 as the game's "director" AI will spawn them randomly throughout the levels. The Tank and the Witch are rarer, since you won't encounter them in every map, but you will encounter them at least once over the course of a campaign.
 * One campaign level in 2 specifically states that you will encounter numerous witches in that area. They're all wandering around as a Type 1 encounter, so you can avoid them if you see them first and know where they are.
 * In The Legend of Zelda: Phantom Hourglass there is a female pirate named Jolene who randomly appears on various maps as type 2 and patrols them as type 3. If she sees you have to escape or fight her off if she boards your boat.
 * The Metroid series has had the Hunters from Metroid Prime: Hunters.
 * The Grells (sand worms) in Space Quest's desert. Also a Drop in Nemesis.
 * The ghost in Spelunker.
 * Most tangos in the early Rainbow Six series are placed at pseudo-random starting positions, and also wander as Type 1. Later games use Type 4; ie they more or less always appear in the same pattern.
 * Jason in the NES Licensed Game of Friday the 13th.

Type 3

 * There's this guy in Baldur's Gate that, if you look at the right (or wrong…) gravestone three times, summons a load of exploding dudes with swords to kill you. I don't think they ever turn up anywhere else.
 * In Super Paper Mario Trueform Mimi pops up in certain rooms of Chapter 2-4 if you dawdle too long picking an exit. She's frightening enough that it can cause you to rush through the level at breakneck speed.
 * From Final Fantasy VI, the Storm Dragon—it will fly out of its treasure chest the instant you open it, and fly circles within the cave until its speed and/or erratic pattern forces you into its path. Final Fantasy VI Advance also adds the Esper Leviathan, who lurks in the ocean between Figaro and Nikeah, and can only be encountered by taking a ferry between the two ports.
 * The Reaper from Persona 3, a Stalked by the Bell-type who will materialize in one of three spots (the staircase, your entry point, or the teleport back to the foyer) and then make a beeline for your party if you linger too long in a single floor of Tartarus. Particularly vicious in floors populated by nothing but the rare, elusive Gold Hand enemies.
 * The Grim Reaper in Alex Kidd in Miracle World appears if you step on a skull block, or is randomly triggered by ? blocks.

Type 4

 * The Metroid series also has had the SA-X from Metroid Fusion.
 * The same can be said for the Rhedogian from Metroid: Other M, which ambushes Samus about 4 times in fixed locations before finally giving up the ghost.
 * The Wandering Monster tables from Dungeons & Dragons are probably the best known example Tabletop Games wise.
 * PuPu in Final Fantasy VIII.
 * The "Mr. X" Tyrant in Resident Evil 2 and Nemesis in Resident Evil 3: Nemesis.
 * The mugger in the dark alley in Leisure Suit Larry.

Special cases

 * In Munchkin, one of the cards that can be played is called "Wandering Monster". It doesn't quite fit this trope exactly, as the monster is "wandered in" by a player.
 * This can be argued to be type 3, since it can be a literal type 3 if the player using the card is the one fighting (adding a creature to your own fight can earn you extra loot and levels). Even using it on one's opponents is a triggered event, just not triggered by the combatant.