Part One: Omniactuality
The Omnidragon is the Progenitor of Dragonkind. He is eternal. He gains his power from the following:
The Six Primalities
Essence of Wind
Essence of Water
Essence of Earth
Essence of Fire
Essence of Light
Essence of Darkness
The Three Dragonboons
Dragonheart
Dragonsoul
Dragonmind
The Dragonosity Core
Part Two: Pantheon of Gods
The Omnidragon had six offspring, who were one another's kin, and the true powers over their elements.
In charge of Wind: The Sky Dragon
In charge of Water: The Tidal Dragon
In charge of Fire: The Inferno Dragon
In charge of Earth: The Terra Dragon
In charge of Light: The Holy Dragon
In charge of Darkness: The Void Dragon
Part Three: The Titans of Passive Fusion
The very being of these Dragons brought forth a new force called Passive Fusion, in which the energies of the very elements withheld by the Gods themselves coalesced into beings of more specific categories, with new and revolutionary powers for reality itself.
(The Titans are more closely related to creatures than the Gods, who are rather the formation of each of the six Primalities. The Titans often stay in a form, and have minds, souls and hearts which branch beyond the basic elements)
Mistveil Dragon (♀) - 
Illusions
Solar Winds Dragon (♂) - 
Dance
Heatwave Dragon (♂) - Heat
Drybone Dragon (♂) - 
Desert, Sand, Bone
Sandstorm Dragon (♂) - Sandstorm
Plasmacides (♂) - 
Plasma, Acids, Poisons
Evolaars (♀) - 
Evolution
Volcanus (♂) - 
Volcano
Soulsyre (♂) - 
Spirits
Despair Abandon (♂) - 
Fear
Elixiris (♀) - 
Elixir
The Alchemical Dragon (♂) - 
Alchemy
Starlite Dragon (♀) - 
Stars
The Tormentor (♂) - 
Destruction
Unita (♀) - 
Peace & Protection
Eradicates (♂) - 
Death
The Twilight Dragon (Half-♀ / Half-♂) - 
Twilight
Storm Dragon (♂) - Storm
Planet Dragon (♀) - Planet
Maniaphuros (♂) - Frenzy
The Genesis Dragon (♀) - Life
Verity (♀) - Truth
The Great Deceiver (♂) - Deception
Apolloryze (♂) - The Sun
Warlord Dragon (♂) - War & Hate
Horizon Dragon (♂) - Horizon
Plaguthor (♂) - Plague
Synth (♂) - Synthesis
Chaos Dragon (♂) - Chaos
Chronicle (♂) - Time
Apocalypse Dragon (♂) - Extinction
Oblivicus (♂) - Agony & Underworld
Metallicus (♂) - Metal
Phantom Dragon (♂) - Ghost
Mirror Dragon (♀) - Mirrors
Wizard Dragon (♂) - Magic Spells
Mystical Ancient Dragon (♀) - Foresight & Wisdom
Elemental Dragon (♀) - Elements
Technodes (♂) - Technology
The Persecutor (♂) - Judgement
Fairy Dragon (♀) - Faeries & Overworld
Nocturnus the Unresting (♂) - Night
Cosmic Dragon (♀) - Cosmosis
Meteor Dragon (♂) - Meteors
Morning Dragon (♀) - Day
The Battle Dragon (♂) - Weaponry
Blessed Dragon (♀) - Blessings
Cursed Dragon (♂) - Curses
Moon Dragon (Dark Side ♂ / Bright Side ♀) - Moon
Systemrix (♂) - Machinery
Soulstealer Dragon (♀) - Steals souls to make (magic-immune) slaves
Laserbeam Dragon (♂) - Lasers & Beams
Songra (♀) - Music
The Shifting Wings (♂) - Shapeshifter
The Seed of Corruption (♂) - Corruption
Heartstealer Dragon (♀) - Steals hearts to make (damage-immune) slaves
Arcanist (♂) - Arcane Magic Spells
Summoner Dragon (♀) - Summoning Creatures
Antepsyc Dragon (♂) - Insanity
Crimnoz (♂) - Crime
Mutation Dragon (♂) - Mutate
Tragedades the Joker (♂) - Meta Humor
The Eclipse Dragon (♂♀) - Eclipse
Part Four: The Children
The kin of the higher beings number vastly in scope and have varying levels of power. These creatures (which are the show's protagonists) are separated into two categories, Major and Minor.
Known Majors
Blood Dragon (1st son of Warlord Dragon) - Blood
Crimson (Blood Dragon's Brother Apprentice, gifted by the Seed of Corruption) - Crimson (Material) and Crimson (Mind-Death)
Luxury Dragon (The Seed of Corruption & Twilight) - Luxury
Pleasure Dragon (Songra & Solar Winds Dragon) - Pleasure
Glory Dragon (1st son of Apolloryze. Created to show his Glory, and therefore inherited the Title of Glorybringer) - Glory
Pride Dragon (2nd son of Apolloryze. Created to lead his many prides of weaker dragons and therefore inherited the Title of Pridemaster) - Pride
Champion Dragon (3rd son of Apolloryze. Created when another Titan questioned his might. He forged a third son to defeat his eldest two, dubbing him The Champion) - Winning
Vampire Dragon (Bourne during Nocturnus' 1st Genesis and consumed the Blood Mixture forged by the Cursed Dragon) - Vampiric
Zombie Dragon (Bourne during Nocturnus' 1st Genesis and was claimed by Oblivicus, being tutored for his father in the Underworld) - Zombified
Werewolf Dragon (Bourne during Nocturnus' 1st Genesis and gazed upon the embrace between the Moon Dragon, Eclipse Dragon and Twilight Dragon) - Werewolven
Festival Dragon (2nd Daughter of Songra & Solar Winds) - Festivities
Known Minors
Uzi Dragon (31st son of the Battle Dragon) Uzi Hands
Circo the Kidder (12th son of Tragedades) Circus Shot, Raise the Mad Klown
Sunkist (Apolloryze's 141st son with Songra) Sun Kiss
Nibbletooth (41st son of Drybone Dragon) Nibble, Tooth Spit
Sandbox (40th son of Drybone Dragon) Enboxen, Develops Creation Magic early in the series
Quicksand (8th son of Drybone Dragon) Sandpit Spell
Part Five: The Broods
The Sires of the Soul - Soulsyre's philosophical bunch
Faeries - While not technically Dragons, they are a very important species, being the brood of the Fairy Dragon and the sole sapient residents of the Overworld.
The Soulless & The Heartless - Two different groups of enslaved and ruined beings
The Summoned - There are unintelligible amounts of creatures summoned by the Summoner over the years, a large portion of the world's residents are those
Apolloryze's Pride - A group of sun worshippers lead by the Pridemaster
Vampires , Zombies & Werewolves - Creatures created by the offspring of Nocturnus' Genesi
The Damned - Those who are kept prisoner in the Underworld by Oblivicus