In the series, Demons are magical creatures renown for their cruelty and affiliation with dark magic. They are, for the most part, incredibly hard to defeat and can cause heavy damage and havoc if going on a rampage.
Krylock DemonThe Krylock Demon is a beast of pure evil that feeds on other magical creatures, such as Unicorns or Leprechauns. It has the head of a cobra and the body of a scorpion. Its venom is extremely dangerous since, if ingested, it can turn humans into Krylock-like creatures. Jake managed to defeat this Demon by turning its own stinger against it, planting it right through its chest.
Shade DemonsThe Shade Demons are creatures called forth from the shadows. They are the loyal servants and minions to the Dark Dragon. They have slender bodies and a skeletal appearance. Although they basically are made of shades, they can fight against others and cause physical harm. To defeat them, one must either deal strong blows to them or exploit their one weakness: light.
Since Shade Demons appear in both Seasons of the show, they have two different designs but still remain similar.