the theory that our actions are always caused by the desire to benefit ourselves

self-centeredness

being flamboyant

exhibitionism, flashiness

a mental illness in which a person has exaggerated ideas of her or his importance, power, wealth etc

self-centeredness

selfishness

egotism

an exaggerated display of wealth, skill etc to get admiration or envy

exhibitionism, flashiness

an official gathering of soldiers etc, especially for a ceremony

pageant, display