Aries are more inconsiderate than narcissistic. They aren't always thinking of others and don't take them into account, even when it's a loved one.
Taurus tends to believe they're better and deserve more than most people. They seem to think that what they do for their own gain is worth it, because they're worth it.
Geminis tend to be too scattered and disorganized to be good narcissists. They're clever and can certainly spin a tale to make themselves look like a hero,
Cancers can be needy like a narcissist and will use whatever tricks they have to keep someone paying attention. But Cancers are too compassionate to be true narcissists.
Leos are so full of themselves that it's not hard to see them as narcissists. They honestly believe the world revolves around them and that they're justified in doing whatever they want to keep it that way.
Virgos have at least one narcissistic trait, which is that they're convinced they're always the biggest genius in the room.
Libras can be very deceptive and superficial. They like pretty things and pretty people, and will use their charm to get them.
If Scorpio is in a good place, they're not that narcissistic, but watch out if they've recently been hurt or betrayed; they become extremely focused on revenge.
If you get in the way of Sagittarius getting what they want, they'll make you regret it. When it comes to saying what's on their mind, Sagittarians can be blunt and don't seem to care how much it hurts.
Capricorns are too dependable and conscientious to be extremely narcissistic. But that's not to say they don't have some narcissistic traits.
If you accused Aquarius of being narcissistic, they'd say you were wrong — they're just independent. Well, they can be independent to the point where they don't think about anything but their own wants.
Because Pisces is usually so selfless, they tend not to be narcissists. They'd have too much trouble being calculating, cold, and insensitive, as those qualities go against everything they stand for.