Demon Sorcerers

Demon Sorcerers are Dark Chi-aligned, malevolent demonic beings that have existed throughout history. 
Only nine Demon Sorcerers, all of whom were related, have appeared in the show. 
They were evil beings who were driven by a desire to conquer and rule the earthly dimension for themselves.
The Demon Sorcerers as a whole could be considered the main antagonists of the series, as the Demon Sorcerer Shendu serves as the overarching primary antagonist of the series, mainley the Talisman Hunt Arc and Demon Portal Arc and his seven siblings as the main focus and primary antagonists alongside Shendu himself in the Demon Portal Arc, while Shendu's son Drago serves as the Demon Chi Arc primary antagonist.
It remains unknown whever the Demon Sorcerers are connected to the Overlord or not.
== Characteristics ==
As the only Demon Sorcerers which appeared in the series were all related, it's unknown how much of their characteristics were unique to them or were present in all Demon Sorcerers. 
Whilst Shendu's son Drago inherited similar reptilian characteristics to his father (but with a somewhat more humanoid appearance) and both were apparently dragons as well as Demon Sorcerers; Shendu's seven siblings were never implied to be draconic, and each had characteristics of different animals and creatures (i.e. insectoid in Tso Lan's case, bull-like in Dai Gui's, piscine in Bai Tza's case, etc.). 
The only specific common physical trait linking the eight demon siblings was that they all had glowing, all-red eyes, similar to other malevolent creatures such as the Chupacabra, the Lotus Temple guardian and the Shadowkhan. Drago by comparison had human-looking eyes with red irises.
Each of the Demon Sorcerer siblings possessed their own unique brand of magic which was derived from a different element for each of them; this magic gave each Demon Sorcerer at least one innate elemental ability (fire breath for the Fire Demon, gravokinesis for the Moon Demon, manipulating waves and forming pressurised sphere of water for the Water Demon, etc.) - the exceptions were the Mountain Demon Po Kong and the Sky Demon Hsi Wu, who only demonstrated physical capabilities related to their elements (physical size and strength, and possibly hunger for Po Kong; and agile physical flying for Hsi Wu). 
Drago by comparison inherited his father's elemental magic, and furthermore displayed fire abilities which his father normally lacked without the Twelve Talismans (namely, conjuring fireballs in his hands, which Shendu seemingly required the Dragon Talisman for).
Apart from their signature abilities, the Demon Sorcerers were also highly knowledgeable on magic. 
Shendu's siblings were able to cast a binding spell on his spirit form seemingly without any ingredients except their own bodies, and Shendu was likewise able to forge a Talisman Locator from his own body (while it was petrified in stone by a chi-spell, no less). 
Other examples of the Demon Sorcerers' knowledge of spellwork include the creation of their Demon Archive, Bai Tza's water-summoning spell, Shendu's concoction of a Petrifying Venom potion, and Shendu's ability to control the Ninja Khan (whose general's mask was in Shendu's palace) without physical access to the mask and seemingly without a spell such as Daolon Wong later required.
Xiao Fung and Hsi Wu both displayed the ability to disguise themselves in human form (described by Xiao Fung as "concealment") - this ability appears to be directly derived from their elemental magic, as Xiao Fung conjured a small whirlwind when altering his form, whilst Hsi Wu produced a burst of lightning when fully shedding his disguise. 
Though both demons retained reflections of their true forms' characteristics while disguised (i.e. similar mouth and facial structures, and a similar physical build in Xiao Fung's case; essentially looking like humanised versions of their demonic selves), it was implied they could manipulate their human disguises to suit their needs - Xiao Fung conjured a prison jumpsuit for his human disguise, and Hsi Wu's human disguise not only included a conjured school backpack but was conveniently a child Jade Chan's age. 
Both demons retained a red eye colour (similar to Drago's eyes) in their human forms - although Hsi Wu's eyes were more of a brown-looking sangrai shade, when he disguised himself to fool the Chan Clan. 
Xiao Fung could still use his Wind Demon ability to some extent in his human form, whilst Hsi Wu could hybridise his human disguise and true form (i.e. morphing one hand back into a claw, and sprouting his true form's wings) - when either demon was using their demonic abilities or was angered, their eyes could briefly revert to their true appearance.
Despite their ancient age (or perhaps in spite of it in Shendu's case, as he was on Earth for all nine centuries of his imprisonment), Shendu and his siblings appear to be at least somewhat fluent with modern technology (demonstrated by Hsi Wu's use of Jade's Moose World camera, and by Shendu cutting off the International Space Station's communications manually).
Shendu and his siblings are apparently long-lived, if not outright in possession of an unlimited lifespan, as the latter group were imprisoned in the Netherworld for over nine-hundred years. 
Uncle emphasised that a Demon Sorcerer such as Shendu cannot be harmed by non-magical means.
However, Drago could still experience pain from being struck by non-magical lightning. 
Magical means are capable of killing the Demon Sorcerers, as happened in Day of the Dragon when Jade used the Dragon Talisman to obliterate Shendu in his stone form; though this is ill-advised by Chi Wizards compared to merely containing demons, as it was stated in the same episode (and demonstrated in Season 2) that destroying a Demon Sorcerer disrupts the balance between good and evil and enables the growth of a "stronger evil" in order to fill the vacuum. 
When Shendu was killed, he was reduced to a disembodied spirit (resembling his physical form's head with a ghostly tail) and iniitally sent to the same dimension where his siblings had been imprisoned.
The Demon Sorcerers' Demon Chi can in some ways be separated from or detach from them under magical circumstances. 
For example, when the Eight Immortals banished the Demon Sorcerer siblings, it caused traces of each demon's chi to cling to the Immortal tool of their respective banisher, waiting for new hosts to bond to once they were reactivated centuries later. 
Drago's natural Fire Demon Chi was somewhat malleable; in that he could transfer samples of it to others at will to grant them Fire Demon powers (and he could just as easily reverse the process if he wished), and Drago's natural Demon Chi could be removed from him with a chi-spell. 
Removing Drago's Fire Demon Chi did not alter his appearance (as absorbing Demon Chi altered its new host's appearance to resemble the original demon) but it did strip him of all his fire powers.
It was never demonstrated if the malleable nature of Drago's Fire Demon Chi applies to other Demon Sorcerers. 
Additionally, absorbing and combining Demon Chi aligned with all eight of the family's elements granted Drago not only all of the Demon Chi's abilities, but also the power to alter the sky and open interdimensional rifts to release demons - chi-spells were unable to remove the extra Demon Chi from Drago after this, and Shendu claimed the combination made the absorption process completely irreversible.
== List of Known Demon Sorcerers ==
# Tso Lan: Moon
# Po Kong: Mountain
# Dai Gui: Earth
# Tchang Zu: Thunder
# Xiao Fung: Wind
# Shendu: Fire
# Bai Tza: Water
# Hsi Wu: Sky
# Drago: Fire