Sylux, as seen in Metroid Prime Hunters.
|Main weapon||Shock Coil|
|Affiliation||Sworn enemy of Samus Aran and the Galactic Federation.|
Very little is known about this character or why Sylux hates the Galactic Federation and Samus Aran. Sylux originates from the planet Cylosis and harbors a strong hatred for fellow Bounty Hunter, Samus Aran, for working with the Federation.
Looking at the overall humanoid shape, and the humanoid hand holding the Shock Coil (Sylux's weapon of choice), it is possible, and sometimes assumed, that Sylux could be human, but has only 3 fingers and 1 thumb. This theory is also backed partially by the use of stolen Federation gear and armor, which seem to be human in shape, however, Sylux's species in the cinematic intro to Metroid Prime: Hunters is labeled as "unknown." Similarly, Sylux's gender is unknown (all entries go out of the way to avoid use of gender-specific pronouns, similar to Samus in the Japanese manual for Metroid), or even if Sylux's species is gendered, adding fuel for further speculation. Another theory is that Sylux could have once been a member of the Galactic Federation, which would explain his similar weapons and armor. His hatred could simply be because he was wounded in some way.
Sylux's ship is the Delano 7, a blue X-shaped ship with aerofoils similar to the Lockjaw form. Along with Samus' gunship, Rundas' Phrygisian-class gunship, and Ghor's Battlesuit/gunship combination, the Delano 7 is one of the few hunter ships to appear in the games themselves, although Weavel's spaceship makes a small appearance in a docking bay during the cutscene for landing on the Oubliette.
A ship that slightly resembles the Delano 7, although with lighter blue coloration and a vastly different hull, can be seen following Samus after the end credits in Metroid Prime 3: Corruption for a 100% item collection rate. 
Like all other Hunters in the game, Sylux is capable of defeating Samus and taking one of her Octoliths. In order to complete the game, Samus needs all of the Octoliths, and thus must fight her thief again in order to gain it back.
Sylux's weapon is known as the Shock Coil. The Shock Coil was a prototype weapon under development by the Galactic Federation. It is an illegal combat technology: It fires a continuous beam of concentrated neutrinos at its target. It was eventually stolen by Sylux, along with a prototype suit and ship, the Delano 7. The Delano 7 is encountered twice in the game, and it is the only Hunter ship other than Samus' seen (in detail) in the game. Interestingly, despite hating the Galactic Federation, Sylux currently only uses equipment that was designed and made by them. It may be that Sylux used to be a GF member and had some sort of issue with them that caused this treachery. This would explain why Sylux hates the Federation and has access to the stolen prototypes.
Sylux has an alternate form known as the Lockjaw. In this form, Sylux becomes a ball of green energy the size of Samus's Morph Ball form, surrounded by two entwined, metal bars that look like a deformed version of the Delano 7 with energy threads connecting them together. Sylux can deal a large amount of damage in this form and is quite agile. While in this form, Sylux can drop two bombs and connect them, unless there are obstructions or they are set too far apart. Once a foe is in range, a third bomb can be dropped which will enclose the enemy and is an ensured kill or at least drop the opponent's damage to minimal levels. (It takes near 200 health to survive the triple attack, while if only hit by two bombs it deals much less damage. When two bombs connect, they form a beam of energy in-between them and serve as a sort of tripwire trap). The Lock Jaw can use its bombs to fly in low gravity areas, which adds to the popularity of being able to combine the Imperialist and use bombs to keep Sylux in the air to snipe opponents, and if rapidly dropped to glide in normal gravity areas, enabling Sylux to skip gaps or reach certain hidden spots, such as a "ghost world" in Harvester.
Super Smash Bros. Brawl
Sylux has also appeared as a trophy in Super Smash Bros. Brawl. It is the only one of the hunters' trophies that is referred to as an "it" instead of a male or female.
"A skilled marksman and bounty hunter experienced in espionage skills such as scouting and tracking. While much of its background remains a mystery, it is clear that it hates Samus and the Federation. Sylux uses the Shock Coil, an experimental Federation-made weapon that continually drains energy from enemies and refills its own."
Nintendo DS Metroid Prime Hunters
- Sylux Metroid Prime Hunters - [Specials: Indirect] Attack +12 (All)
Metroid Prime Hunters manual
"Sylux is a resourceful tracker, and a deadly sharpshooter who harbors an intense hatred for the Galactic Federation and for Samus Aran for assisting the Galactic Federation in the past"
Nintendo Power March 2006
"Sylux's background is unknown, but the hunter's motives are clear - to crush the Galactic Federation. Using technology suspiciously similar to a stolen Federation prototype, Sylux can deploy blades that travel along beams of energy while the hunter is in ball form." 
"Little is known about the mysterious bounty hunter known as Sylux, other than the fact that Sylux harbors an intense hatred for the galactic federation and the bounty hunter who has helped the Federation time and time again... Samus Aran."
- In the Metroid Prime Hunters Official Nintendo Player's Guide, it incorrectly states that Sylux turns invisible when equipped with the Imperialist. Though this may just be a typo or a printing error as the exact same sentence is used on Trace's page (Trace is the only one who turns invisible).
- Sylux's Lockjaw form is designed very similar to Samus's own Morph Ball. It has a storage of three bombs and has the same glowing green orb. The alternative form may suggest that the Galactic Federation has begun to construct prototypes of Samus's gear, which is further progressed with the downloadable data in Metroid Fusion.
- Metroid Prime Hunters
- Metroid Prime 3: Corruption (Possible Delano 7 appearance.)
- Super Smash Bros. Brawl (Appears as a trophy and sticker)
- Metroid Prime Hunters Official Nintendo Player's Guide
This is the music heard when battling Sylux: 
| Samus Aran|
'Big Time' Brannigan • Armstrong Houston • Zegan Doh
Sylux • Weavel • Kanden • Spire • Noxus • Trace
Rundas • Ghor • Gandrayda
Dark Panda • HWCASE • Georgia McHenry