Cut Halo 3 enemies and NPCs
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Accessible via the files of the Halo 3 Editing Kit, a number of female civilian models can be found. These civilians wear industrial jumpsuits like the male civilians found in the campaign level The Storm. Unlike their male counterparts, the female civilians do not share their face models with the female Marines, possibly due to being a leftover from an earlier stage of development.
The Brute Tracker is an unused Brute enemy rank found in the files and early builds of Halo 3. The version seen in the Halo 3 Alpha builds is green in colouration, without the blue colour overlay present in the final game's shaders. The Tracker uses a helmet model look similar to the Stalker, with armour and shoulder pauldrons reminiscent of the infantry and captain Brute ranks featured in the game.
Early Brute designs and colours
Seen in early Halo 3 Alpha footage and included in some final-game publications are variations of Brute enemies, sporting a much more vibrant armour colour scheme when compared to the final game. The most prominently-seen of these variants is a variant of the Brute Captain enemy - seen sporting a red-coloured power armor design. For reasons unknown, in the final game the shader implementation for this enemy type has the colour overlayed with a strong blue, though images of this enemy can be found in the Halo 3 manual and the Bestiarum booklet included in the Halo 3 Limited Edition. The comic series Halo: Uprising used the red design of the Captain for the character of Lepidus.
Early revisions of these Brutes also have some fur on their arms more akin to their Halo 2 counterparts, though the fur clips through any armour present on the forearms.
Stealth Sangheili are an NPC type found in the files for Halo 3, though go unused. The files feature two ranks; Stealth Minor and Stealth Major, both of whom wear the combat harness with no shoulder plating. The Stealth Major has its colour set to brown, but due to the shader configuration ultimately ends up looking grey.
The Stealth Minors do make an appearance in the Halo 3: ODST level Tayari Plaza, wherein their dead bodies can be found littering the streets of New Mombasa - having been killed by Brute forces prior to the level's start.
Halo 2 leftover Elites
A number of leftover Elite characters can be found in the files of the Halo 3 Delta build. These consist of all of the Elite enemy rank types featured in the prior game, though updated with some early and unfinished Halo 3 character models (all using the standard combat harness). Most of these were never intended to appear in the final game, though are listed below.
Found alongside the Halo 2 leftover Elites in the Delta build are a series of Elites that spawn holding specific weapon loadouts. It is unclear why these Elites exist, and it may simply be character bipeds used for testing features. Alternatively, they may be a remnant of a weapon loadout system considered for Halo 3. The weapon Elites are as follows;
All of the weapon elites additionally have a frag and a plasma grenade attached to their chestplates.
The "banger" is a variant of pod infector found in the files for the Halo 3 mission Cortana, found as a tag in the pathway
Concept pure forms
These concepts for pure forms of the Flood are featured in The Art of Halo 3, pages 26–27, though it is unlikely they were ever seriously prototyped in-engine or developed in 3D. They are as follows;
The Guardians have a storied history with the Halo series, with their core idea dating back to the development of Halo 2. Notably, the Guardians were heavily developed for Halo 3, with many pieces of concept art created for their design. The Guardians were to feature in the eponymous level Guardian Forest as enemies, with a model and animations being created for them, and the in-game character in iteration. In the level, the player would have been able to rip out the Guardian's "eye" and use it as a laser weapon. Unfortunately, the level and the Guardian enemy had to be cut, with the level being repurposed as the Guardian multiplayer map and the Guardian enemy model itself used on Epitaph in holographic form. The Guardian was intended to be similar in size to the similarly-cut Strato-Sentinels. While not seen in the final game, their design was later used in Origins for two Forerunner constructs seen escorting a Keyship to the Portal at Voi. The Guardian hologram reappears in Halo Infinite. The Halo Encyclopedia (2022 edition) reveals that the holograms of the Guardian Sentinels were repurposed as in-universe holographic representations of Offensive Bias.
According to Art of Halo 3, "The Guardian evokes memories of Compilers (from one of Bungie's previous games, Marathon) and the robes of a High Court Judge - which is fitting because, as anyone who has encountered them can tell you, their judgments are swift and final, and their logic utterly alien."
The Strato-Sentinels were a concept heavily explored in Halo 3's development, with multiple variations of concepts explored. Some of these were later reintroduced into canon as the Assembler, Excavator, Extractor, Retriever and Steward Sentinels.
A number of bird ambient creatures can be found leftover in the Halo 3 files. These include the Cockatoo, Guira, Hornbill and a small flock.