oh! thats so funny, the top right one I've seen a picture of before, I actually prescribed that to Jules XD (Tho I would also say Urchin)
bottom left I'd give to Lars
Top left I'd actually suggest that to Dia's Eridan XDc
I actually love finding shirts like these and sending them to her saying who they are lmao. Marcus has a running joke where he has a HUGE collection of inappropriate sex/cock related ones, tanktops, sweaters, you name it, that his mother HATES.