compulsive - a person with a compulsive disposition; someone who feels compelled to do certain things

streaker - some who takes off all their clothes and runs naked through a public place

egoist, egotist, swellhead - a conceited and self-centered person

grandstander - someone who performs with an eye to the applause from spectators in the grandstand

hot dog, hotdog - someone who performs dangerous stunts to attract attention to himself

poser, poseur - a person who habitually pretends to be something he is not