History Main / UniqueEnemy

** ''SymphonyOfTheNight'' has the Dodo bird, who appears in one room and runs for its life the moment it sees you. Killing it gives you a chance at an InfinityPlusOneSword [[RandomlyDrops drop]].

* The original ''DonkeyKongCountry'' had Rockkrocs, and the almost completely invincible gray Krushas in "Platform Perils".

* In ''SonicTheHedgehog3'', the manual states that of the monitors that give you power-ups, there are some throughout the game with Robotnik's face on them. These cause instant death or ring loss. ''However'', there are all of '''two''' of them, they're both in the same Zone, and not the Zone the manual hinted they'd be in. Due to this Zone, you also have to hit them twice to open them, causing it to mainly be something you'd have to go out of your way to have kill you.
** Not true, they're in Launch Base too, a pair in one area, and a single one after you go through a chute.
** There are also only two in the sequel game Sonic and Knuckles, and again, you'd have to go out of your way to hit them.
* At the start of the Starbase level in TMNT IV: Turtles in Time, there is a robot moving up and down who fires lasers at you. It takes one hit to kill, and no more appear.

* Corsairs from Fire Emblem

* In ''{{Marathon}} 2'', the "[[KingMook mother of all Cyborgs]]" only appears once, on the level "Sorry Don't Make It So". ** In ''Infinity'', it became a recurring (but rare) enemy, and they were even more common in the ''EVIL'' GameMod.

* Two Klobbers, which debuted ''Donkey Kong Country 2'', make a random appearance in one level in ''DK: Jungle Climber''.

* ''YoshisIsland'' has many examples that appear in only one castle or fortress stage, such as Bouncing Bullet Bill, Georgette Jelly, Grim Leecher, Piro Dangle, and Kaboomba. Yoshi's Story is similar, with enemies like Blindfold Boo and Barbecue Guy only appearing in one stage. Because all bosses in Yoshi's Island are of the KingMook variety (after a MakeMyMonsterGrow sequence), many are based on enemies that appear in the boss's level (long enough to "establish" them as monsters) and nowhere else.

* ''YoshisIsland'' has many examples that appear in only one castle or fortress stage, such as Bouncing Bullet Bill, Georgette Jelly, Grim Leecher, Piro Dangle, and Kaboomba. Yoshi's Story is similar, with enemies like Blindfold Boo and Barbecue Guy only appearing in one stage.

* Because the bosses in ''[=~Yoshi's Island~=]'' are all GiantMook types, a few of them are based on minor enemies who only appear in the boss's level long enough to be "established" so Kamek can make a boss of them at the end.

** Although it doesn't attempt to kill you, Morrowind has [[http://www.uesp.net/wiki/Morrowind:Mudcrab_Merchant the Mudcrap Merchant,]] who has more money than any other merchant in the game.

* The original ''DonkeyKongCountry'' had Rockkrocs.

* In SonicTheHedgehog3, the manual states that of the monitors that give you power-ups, there are some throughout the game with Robotnik's face on them. These cause instant death or ring loss. ''However'', there are all of '''two''' of them, they're both in the same Zone, and not the Zone the manual hinted they'd be in. Due to this Zone, you also have to hit them twice to open them, causing it to mainly be something you'd have to go out of your way to have kill you.

* The original ''DonkeyKongCountry'' had Rockrocs.

** Some of the enemies in the Glitz Pit and Pit of 100 Trials.

* In ''{{Marathon}} 2'', the "[[KingMook mother of all Cyborgs]]" only appears once, on the level "Sorry Don't Make It So". In ''Infinity'', it became a recurring(but rare) enemy, and they were even more common in the ''EVIL'' GameMod.

** [[NightmareFuel Kackle]] from "Haunted Hall", another MinecartCarnage level.

** SuperMarioGalaxy had the lone Grand Goomba, which was too big to jump on.

* The X-Yux in ''PaperMario: The Thousand-Year Door''.

** [[NightmareFuel Kackle]] from "Haunted Hall", another MineCartCarnage level.
** The faster, [[RealMenWear pink]] Krunchas found in "Castle Crush" and "Clapper's Cavern".

*** Wrong. The Axe Knight is a recurring enemy in the VeryDefinitelyFinalDungeon.

** ''Cave Story'' also has the mimic door and chinfish, both of which appear once near the start but never again in the game. Basil, an invincible enemy that can one-hit-kill you, only shows up in the undamaged Egg Corridor (although it functions more like a deadly room feature than an enemy), and an exploding green cloud only appears in the ruined Egg Corridor. The Gravekeeper is another unique enemy of no greater significance.

** ''Majora's Mask'' has one Peahat hidden in a pit in Termina Field; kill it for a PieceOfHeart and you've never got to fight another one.