"personality"? t-shirts don't get much more personality than they have at [warning, may be some NSFW content]
Try Abercrombie and Fitch. They have fitted shirts. Also try threadless.com. Those shirts are slim fit. I'm pretty sure Volcom and quicksilver sell fitted shirts also. Try dry fit shirts as well. I hope I answered you question : / Good Luck!
most of my shirts do advertise holliser, abercrombie, american eagle, ect. i like them, i don't think it really matters to other people what you wear as long as you like it.