I can think of several citations for the Personality section, most of them quotes by Jafar himself. I shall list them below.

Jafar is portrayed as a megalomaniac (Jafar himself crows "The power, the absolute POWER!") who will not hesitate to destroy anyone he perceives as a threat to his own sinister designs ("I think it's time to say goodbye to Prince Abubu"). He wears a metaphorical mask of normalcy throughout the film, establishing himself as a cool-headed schemer and gaining the trust of those around him ("You are most gracious my liege" - "I assure you your highness, it won't happen again"), despite his rather untrustworthy physical appearance. Even with this mask, Jafar's villainous tendencies tend to seep through and become apparent to the viewer, particularly in the opening sequence, where Jafar displays no remorse in sending Gazim the Thief to his death in the Cave of Wonders, simply proclaiming that "Gazim was obviously less than worthy" in a rather dry tone of voice. The deleted song "Humiliate the Boy" also establishes Jafar as an emotional sadist, getting a laugh out of seeing "another fellow's dreams turn into nightmares one by one" and treating the Genie in an especially harsh manner (one only has to watch the video, a link to which is provided, in which Jafar viciously tugs the genie's beard several times whilst shouting orders like "Do as I say"). It is not until Jafar gains control of the Genie's lamp that he fully shows his true colors, becoming even more arrogant and short-tempered with his subjects after usurping power from the Sultan ("Don't talk back to me you big blue lout! You are to do what I order you to do! Slave). It is this impulsive behavior that leads to his downfall, as he uses his third wish to become an omnipotent genie, unaware of the life inside the lamp that he now has to endure.

Jafar is usually shown to be somewhat comedic and plucky (giving a slightly human side to his usual malevolence, a trait not often seen in Disney villains), even in his times of evil and cunning, proclaiming "Ewww..." when contemplating decapitation. This, however, doesn't keep Jafar from having a sub-par sense of humor himself, spurting several puns in a row while keeping Aladdin and his friends from getting the lamp during the film's climax ("Your time is up!", "Don't toy with me!", "Things are unraveling fast now, boy!", "Get the point?", "I'm just getting warmed up!") This comical humor does not carry over in the film's direct-to-video sequel, which aimed to make Jafar more sinister and ruthless, though it is referenced in Jafar's role in "Hercules and the Arabian Night".

Can't think of a citation for that last sentence so maybe we should leave that out. Any thoughts?