Type A

• Considerate about everything
• Prefer peaceful human relations
• Slow to trust people
• Observe social rules and customs
• Regard social order as important
• Restrain actions and expressions
• Apt to think conventionally
• Pessimistic about the future
• Tries to be optimistic about the past
• Perfectionist
• Endure continuous efforts
• Weak at maintaining the status quo
• Weak at keeping continuous and intensive interest
• Emotional wounds heal slowly
• Strong desire for transformation
• Seek one's raison d'etre
• Make a distinction between right and wrong
• Attentive to one's own security
• Less expressive than Type O and Type B
• Anxious

My summary from Mr. Masahiko NOMI's book "Ketsueki-gata Josei Hakusho" (Blood-Type Woman White Paper).

Basic personality of type A is rather difficult to describe. However, there are two major ones: 1) sensitiveness to the society and 2) safe consciousness. 
The former equals with type O's sensitiveness to the power. The range of the "society" differs by individuals. A Japanese proverb says "the shame of journey is scraping" [What happens in Vegas stays in Vegas]. It is really for type A. It is a journey that type A get out from the society. 

There are many type-A "honor students". Type-A people usually respect social customs, rules and common sense. However, to the contrary, some Type-A people repels worldly things. Both come from the sensitiveness to the society.

Generally, the former is seem to occupy majority. I have an impression -- maybe due to racial differences -- that there are more strong active type As in Westerners.

Another personality, perfectionism, already appears in even infant period.

The perfectionism is applied to everyone. Even scrupulousness, elaborateness, prudence etc. are born from the strong sense of responsibility and independence. On the other hands, perfectionism for other people is easily to become a "type A of nag".

The perfectionism and the unyielding nature is easily combined to form argumentative personality. The fame of obstinate stubbornness prevails. Type A seldom apologizes. Gentleness and stubbornness, these may be one of the Type A's of dual nature.