Name

The first name of Seifer creates a shrewd, aggressive, business nature, intent on personal gain. You are capable of very logical and analytical thinking along practical business lines, and could excel in financial fields, law or politics. Your judgment is seldom swayed through your feelings. You have definite executive and leadership abilities, however you are inclined to be too blunt and forceful in dealing with people. There is a need to show more tact and understanding toward others in order to moderate a rather self-centred nature. The desires for independence and financial success have been strong motivating forces from very early in your life. Sacrificing much for material ambition will result in a lack of harmony and balance in your personal life, particularly a lack of appreciation for social courtesies and things of a more inspirational nature. Your health could suffer through ailments centering in the head. Also, the generative organs could be affected.

from Kabalarians.com

Seifer, is in fact, a person that probably does everything for personal gain - he wants to experience fame and glory. His judgement, however, is swayed by his feelings 100%; he never really takes time to think things through and makes rash decisions depending on the situation. He does exude a self-centered nature, thus his overconfidence and pride.
Seifer:
Status is important to you and your ability to achieve success and earn money. You have a need to be noticed and seek status. You can be quite inventive and quite curious. You are relatively demonstrative in your affections. You enjoy being stroked verbally and physically. You are naturally friendly. You can be the life of the party. You need to learn to be expressive. You are a person who cannot tolerate being misunderstood. You enjoy a challenge. You can take thought-directed actions.

Almasy:
You are adventurous with a tendency to be foolhardy. You are aggressive and definitely have leadership abilities. You have a diplomatic flair to your nature. Equality and fairness are important to you. You are always involved with projects and things to do. You have a need to be up front. You have a need to earn money to prove your success to society and must learn the true value of material gains and status. Your independence and freedom are important to you.

from miva.zodiacal.com/acro.mv

Throughout the whole entire game, all Seifer wants is to be accepted - he wants to gain status as a SeeD and he does want to be noticed, thus his bully complex. Seifer believes he is misunderstood during the game, saying that he isn't a monster and only the sorceress' knight and repeatedly makes comments of the same or similar definition during battles. Seifer may have great leadership abilities, but his greatest fault is not being able to follow others' orders.

FFCompendium also brings about an interesting revelation; Seifer's name is pronounced much like the English word Cypher (Cipher), which can be defined as:
Cipher: (ci·pher also cy·pher, n.) One having no influence or value; a nonentity.
Seifer, no matter which way you look at it, is considered the puppet, pawn, and lapdog of the game. Even though he believes his role as a sorceress' knight was noteworthy, the fact remains that Ultimecia could've just disposed of him easily and obtained another knight.

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