The easiest way to explain it would be... If you liked The Powerpuff Girls and / or Foster's Home For Imaginary Friends... The creator is the same person, and brought all of what made those shows great to this. It also has a writer and producer (if I remember my facts correctly) from Rocko's Modern Life (although it's by far less... raunchy, lol). The characters are very well developed and, for the most part, likable. They each have their own highs and lows, good characteristics and faults, without it feeling forced like a lot of shows tend to do. The animation and art is wonderful, the music is catchy, and they treat the viewer as though they have a brain (subtlety instead of shoving everything in your face, as well as continuity that flows through the episodes in an extremely subtle way). It's just extremely enjoyable and cute. Oh, and they have a LOT of creatures from various myths and stories. Dragons, phoenix, ursa major / minor (as a creature), Cerberus, centaurs, etc.