Well, Jill is clearly the Jungian archetype of the "maiden", all about ingenuity, purity and chasteness, while Quinn is the "outlaw". She´s a revel living by her own rules, has independent thinking, but usually is selfish and tends to crime. Neil is the "everyman", the voice of the common sense. Derek is the Jester, funny and superficial, but sometimes sees things that others can´t. There is some kind of wisdom into him. Tremolo is a mix between the "lover" and the "hero". He starts mostly like the first one and evolves to the second. All those archetypes can evolve (and are evolving, Quinn for example) during the story.
A stereotype is an oversimplification of an archetype. Tybald is an oversimplification of the "Jester", a comic relieve but without any wisdom. And a cliché, is an idea so repeated by the mainstream that becomes a common place, something worn, predictable and boring. Maya and his evil middle aged white straight religious father, for example.