The sign of the Zodiac one's birthday falls under often has personality traits attributed to it. Just as in real life, though, don't assume a character's personality will always fit.
Enterprising, incisive, energetic, spontaneous, courageous. Straightforward dreamers, they are poor liars and hold loyalty in high regard. Direct, frank, and honest. Quick and capable, but often with a low pain threshold. Sometimes they rush to make a judgment or decision without knowing all the facts.
Practical, trustworthy, loyal, humane, and generous. They tend to be taller than average, calm and pleasant, and artistic. "Slow and steady" are their watchwords; when they focus on a task, they will work at it carefully and with great persistence until it is complete. They are typically very healthy and strong, both physically and mentally.
Cheerful, versatile, enthusiastic, witty, good at socializing. However, they often hold themselves at a distance from events, which can be seen as cruel or selfish. They are never content with what they have, and are constantly finding new interests, only to discard them when something else catches their eye. They are honest but also diplomatic. They can easily do two things at once, but they lack patience and persistence.
Sympathetic, imaginative, sometimes flamboyant, and usually possessed of a good sense of humor, yet they are at base pessimistic, moody, and easily hurt or swayed by emotion. They do not like to discuss their own feelings, but are glad to hear about others'. They crave comfort and security, and tend to prize "home" more highly than love, fame, money, and so on.
Dignified, loyal, romantic, optimistic. They are superb organizers and very generous with both advice and material objects; however, they are hurt when their advice or generosity is rejected. They are easily swayed by flattery, and typically have very refined tastes. They are reluctant to rely on others for anything.
Analytical, methodical, hardworking, often critical, Virgos tend to be quiet, but very expressive when they do assert themselves. They are emotionally cool, but dependable, sincere, and capable. They tend to be very fastidious, and can be easily annoyed by vulgarity, stupidity, or carelessness.
Diplomatic, alert, broad-minded, and easy-going. They have a gentle, affectionate nature and a keen sense of honor and justice. They are fond of beauty and symmetry. Though they don't appear to be too strong, they tend to have great stamina. Libras are often turned to by their friends as mediators.
Shrewd, resourceful, courageous, and strong-willed, with dominating personalities. They tend to take great care with their appearances. They are sometimes possessive and jealous, and have very long memories for wrongs done to them. They are patient and subtle, often drawn to scheming, and possess keen intellects. Many are also very literary or possess artistic talent.
Generous, fearless, independent nature-lovers. Swift and sudden in speech and action, and often quite brilliant. They are bold and truthful, but often also overconfident and crude or tactless. They tend to be very social, making friends easily, but some prove treacherous. Any enemies they make will often be bitter and very persistent.
Ambitious, relentless, logical, and industrious. They are often great lovers of music. They are cautious and hard-working, and tend toward being pessimistic. They are very active, serious, and practical, and they sometimes seem to lack warmth, but they are actually loving and devoted. They like to be helpful, but in a quiet, non-demonstrative way; they are usually very humble and dislike attention.
Creative, eccentric, unconventional seekers of truth. They are often funny, independent, and sympathetic, but they can also be conceited, perverse, and timid. They often feel most at home in a crowd, and tend to have many loose acquaintances but few close friends. They seldom settle down to a steady relationship. An Aquarius rarely takes others at face value, and is often perfectly willing to ask embarrassing questions to discover what's behind that face.
Intuitive, understanding, and self-sacrificing people, often possessed of a strong sense of beauty and an affinity for visual art. They tend to be escapists, and are often melancholy, hypersensitive, irritable, or lacking in self-restraint. However, they have a polite, kind, and helpful nature. They are usually polite and modest, and typically very social; they rely on friends a great deal.