Daedric Princes (sometimes referred to as Daedra Lords or The Old Gods by the Reachmen of Skyrim) are the most powerful of the Daedra and thus most commonly worshiped by mortals as deities. While Daedra can manifest as either male or female (being, in reality, genderless), all of these high Daedra are typically referred to as "Princes."
Every Daedric Prince has their own unique plane of Oblivion.
The mortal races naturally derive their conception of morality from the Aedra that created them, and as the Daedra had no part in the creation of the mortal plane, the Daedric Princes operate on a different plane of existence from mortals and possess an incomprehensible concept of morality. For this reason, scholars suggest that none of the Daedric Princes can be considered objectively "evil." However, a number have been known to consistently inflict harm on the inhabitants of Nirn. Daedra viewed as mostly if not wholly malevolent include Mehrunes Dagon, Vaermina, and Peryite.
Daedra viewed as mostly if not wholly benevolent include Meridia and Azura.
Dealings of mortals with the Daedric Princes are not unheard of but often end up harming the summoner as opposed to bending the will of the Prince. It should be noted that dealing with the Princes sometimes causes changes in appearance, such as black dots in the white of eyes or strange eye color.
Each Daedric Prince holds some degree of "patronage" over a physical, philosophical, or metaphysical concept or state of being. The varied and wide range of these aspects has nurtured a devoted following amongst the mortals that hold them as figures of worship- either in spite of or in reaction to the teaching of the Divines. While some of the Princes are unconcerned for the well-being of their followers, with some actively causing harm to them by some means, other Daedric Princes have been known to both reward and actively protect their followers.
The Pantheon
Azura – A Prince who maintains/draws power from the balance of night and day, light and dark
Boethiah – The Prince of deceit, secrecy, conspiracy, treason, and unlawful overthrow of authority
Clavicus Vile – A shape-shifter, who grants power and wishes through ritual invocations and pact
Hermaeus Mora – The formless Daedric Prince of knowledge and memory, seeks to possess all that is knowable
Hircine – The Prince of the hunt, sport, the Great Game, and the Chase
Jyggalag – The Prince of logical order and deduction, upholds strict order above all else
Malacath – The Prince whose sphere is the patronage of the spurned and ostracized
Mehrunes Dagon – The Prince of destruction, violent upheaval, energy, and mortal ambitionMephala – The Prince of unknown plots and obfuscation, a master manipulator, a sewer of discord
Meridia – The Prince of the energies of all living things, enemy of the undead and all who disrupt the flow of life
Molag Bal – The Prince of domination and spiritual enslavement, seeks to ensnare souls within his domain
Namira – The Prince of the "ancient darkness," the patron of all things considered repulsive
Nocturnal – The Prince of the night and darkness, the patron of all things secretive
Peryite – The Taskmaster, the Daedric Prince of Pestilence, desires order in his domain
Sanguine – The Prince of hedonism, debauchery, and the further indulgences of one's darker nature
Sheogorath – The infamous Prince of Madness, whose motives are unknowable
Vaermina – The Prince of dreams and nightmares, a deliverer of evil omens and dark portents
Subject: The Daedric Princes 
