Sagittarius is a fun and exciting sign. The explorer and philosopher of the zodiac, they are typically interested in new experiences, new knowledge and new places. Very spontaneous people they tend to dislike anything which restricts their freedom to learn and grow and often are the most courageous sign when it comes to relying on luck in any endeavor. Direct speakers they tend to be straightforward and objective (which is loved by the fire and air signs and detested by the water signs!)
Enthusiastic
Passionate
Adventurous
Direct
Perform well under pressure
Unemotional (not moody or sensitive)
Exciting
Extrovert
Self confident
Optimistic
Outgoing
Ambitious
Spontaneous
Independent
Courageous
Straightforward
Flexible
Adaptable
Balanced
Curious (bad side = nosy!)
Rarely possessive or jealous
It's worth noting that most good Sagittarius traits and characteristics have an equal and opposite bad trait or characteristic. For example, someone who is highly analytical could be described as either intelligent (good) or unemotional (bad). Someone who is spontaneous (good) is also impulsive (bad).
Irresponsible
Aggressive
Verbally Confrontational (can be a good thing)
Bored easily
Impulsive
Impatient
Reckless
Blunt spoken
Indecisive
Flighty
Restless
Starting new projects
Freedom
Risks
Excitement
Living for the moment
Romance to be fun and exciting
Finish projects
Boredom
Routines
Planning
Being restricted
Too much commitment
One of the fascinating things about astrology is the patterns which exist. Sagittarius personality traits certainly aren't random. They come from a combination of the signs ruling planet, element, polarity, house and quality. All of these are also used (consistently) elsewhere within astrology and come together to form the unique package which is the Sagittarius personality.
No. The above traits exist if someone has a Sagittarius sun sign. However every individual also has other planet placements (Moon, Mars, Venus etc) which modify this behavior. In some cases one or more of the basic personality traits listed above will be modified or even replaced. Only by examining all the planet placements for an individual can we get a complete picture of their unique personality. A skilled astrologer can often calculate these backwards from the ways that the basic sun sign behavior is being modified.
As children we are subjected to many experiences and influences. These can lead to a determined effort to modify our personality and behavior. The traits still exist, but they can be over ridden by free thought. It's fairly common for negative traits to gradually diminish as a person gets older, wiser and more socially adept.