Purple caste

The title of this article is a combination of two terms which have not been used together canonically, but is based on their use in the comic. "Purple Signs are the workaholics of the sign classes. Ambitious and driven, they have a very specific path in mind to reach the pinnacle of their field, and will work tirelessly toward it. However, if their practical brains convince them that their goal is unrealistic, they may be slow to trust anyone with the secret of their true desires. They are often very funny, their wit veering toward the dryly macabre. Their fatalism can be incredibly humorous or terrible, depending who you ask. Purple Signs are usually the people who will say out loud what everyone else was thinking but was too nervous to mention. They are very stubborn, and once they've made up their mind about something, whether it be a restaurant choice or a political affiliation, it is difficult to change. They have trouble admitting they were mistaken, and also that they are upset. An oft-repeated phrase of the Purple Signs is, "It's fine, don't worry about it." They will let arguments fester rather than face them head on. In love they tend to be strictly monogamous and fiercely devoted, ready to pledge themselves to a person the same way they do their goals-utterly, and without reservation."

- The Extended Zodiac

The purple blood caste is one of the twelve troll blood castes, higher than indigo and succeeded by violet.