Fanon:Yellow Falcon (GellyPop)

The Yellow Falcon are collective group of enemies that may be encountered randomly in Diep.io, regardless of game modes.

Divisions
The Yellow Falcon has four divisions. These divisions are used to determine what type of Yellow Falcon enemies will spawn on a location if allowed. While most enemies may appear in any game mode, some enemies tend to spawn more frequently in a given game mode, such as in Maze.

The divisions are as follow:
 * Militants: The lowest rank of Yellow Falcon units. They are the most common to encounter. Usually, they have low health and are an easy enemy to deal with, although a mass number of them are pretty deadly. Militants are usually accompanied by Mechanisms, and they may sometimes found along with Captains.
 * Mechanisms: Yellow Falcon rank composed mostly of stationary units. They take more damage than the Infantry units, and usually uses auto turrets as their main weapon. They are usually found with Militants, but they never spawn along with Creeps.
 * Creeps: This rank are formed by Yellow Falcon with strange, bizarre designs. As such, they range from low-health melee attackers to durable creatures shooting other from their rank division. They have a higher ranking than the Mechanisms due to their hard-to-counter tactics that may exploit the players' weaknesses. Militants rarely accompanies them, while they may be found alongside Captains, depending on type. However, Creeps do not spawn with Mechanisms together.
 * Captains: The highest rank of Yellow Falcon, they are the leaders of said group. They act as Mini-Bosses of their own right, with their firepower almost matching those from the actual Bosses such as the Guardian or the Fallen Booster. They spawn the rarest out of all Yellow Falcon enemies, and no multiple Captain enemies of the same kind may spawn in a single server. Depending on the kind of Captain that spawns, certain types of lower ranking Yellow Falcon units may accompany and fight alongside them.

Behavior
Generally, the Yellow Falcon are hostile towards all players, regardless of their teams. They have the same detection range, no matter their division. They do not attempt to escape or surrender when low on health, and instead continues to attack, even if there are no hope for them to survive. Each enemies have different movement and attack pattern, though. Likewise, they also attack captured Dominators, which if they succeed, can turn those as contested.

Charger
Chargers are the most common and weakest enemy unit of the Yellow Falcon. They have a yellow circular body with a small cannon on their front which looks like the same size from that of the Gunner Trapper. On their back is an auto turret, but with no visible cannons mounted to it. Upon spawning, they stay stationary, until they detect a player from their small radius (on which usually players otherwise can see them before Chargers see them), on which they will charge straight towards, hence their name. They cannot change their angle while moving towards, although sometimes they may stop moving, either to shoot from their cannon, or to change angle and charge again. If they charged towards a Maze wall, they will immediately charge to another angle without delays. If a Charger successfully hits a player, they deal very high Body Damage, usually killing the player. They have a very low health though, even dying from a single shot of an upgraded Tank. However, the bullet fired from their cannon is actually deadly, and can kill a tank with low Max Health upgrade in one shot.

Watch Guard
Watch Guards are enemies that are a bit higher than Chargers in terms of hierarchy of Yellow Falcon. They have the same yellow circular body of Chargers, but their small cannon is the same length of that of Ranger, complete with a trapezoid base, and no auto turret. Suggested by their name, Watch Guards are stationary, spinning in place if no players are being detected. Upon detecting one, they attack by either shooting a stream of three small bullets that all follow the same trajectory but usually misses, or a single but very precise shot towards the target. Both bullets are still as deadly as from the Chargers. Watch Guards still have the same low health Chargers have, though, but still possess the deadly Body Damage they have.

Skyblaster
Skyblasters are stationary enemies that are quite hard to deal with. They generally look like yellow circles with a larger circle around with the color of the tiles, and a miniature version of Sitebomber Launcher. Upon spawning, they look like translucent circles and cannot be hurt. They will only start attacking and revealing their true appearance when a player approaches. They attack by firing a dropbomb that moves slowly (noticeable with the shadow). The dropbomb then splits into three smaller dropbombs that goes to different directions. The dropbombs then actually drop and explodes on certain locations. Each explosion cover a small radius, but they possess 5x the deadliness of a Charger's bullet. Skyblasters themselves may only be hit when exposing themselves, which takes around two to three seconds, before hiding again. They still have the low health, but they do not possess the deadly Body Damage other units have.

Gun Operator
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Shooter Agent
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Mine Roller Agent
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Grenadier Agent
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Roto-Turret
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Hidden Cannon
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Roll Mine
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Wall Gun
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Security Core
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Wall Tri-Gun
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Robo-Winged
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Robo-Pistol
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Twisty
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Crawling
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Wall Chomp
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Chomp Vomit
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Crawl Nest
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Wall of Artillery
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Fire Ringer System
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Devastation Gate Guardian
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Phantom Twins System
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Warmonger Wheeled Fortress
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Telekinetic Saucer
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Mega-Sized Brute
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Head of the Hive
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Heart of the Hive
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Trivia

 * The Yellow Falcon and all its enemies are massive reference to the enemies found in the NES version of Contra, which otherwise known in group as the "Red Falcon".
 * Most of the enemies are readjusted or have changed behaviors to fit diep.io's topdown gameplay.
 * It is unknown whether or not more enemies from the other titles will also be included. This is the reason why some of the arcade version exclusive ones such as "Necroid" (which if included, may be called as "Thrusting Stabbers" as based on their behavior) are not added.
 * The Militants represent the (brainwashed) human infantry enemies, the Mechanism representing the turrets and other mechanical enemies, the Creeps representing the aliens, and lastly, the Captains represent the bosses. "Dogra", or known here as Warmonger Wheeled Fortress, is technically a miniboss from the original game, but it was considered here with the same rank with actual bosses from the original game.