Note: This will probably take awhile.
Buttercup:
Drew Struzan, for he too has made his living thanks in no small part to Harrison Ford.
Smirk:
Gustave Caillebotte, for the French influence (much like your hometown) and the fact that he's often overlooked when compared to his contemporaries, but no less good.
Gigilo Joe: I don't really know you, so I haven't gathered feelings about you one way or the other. But your name has a robot in it, so I assume you like robots. Thus, I assign you
Caza, famous for painting robots and other science fiction things.
Swykk:
Dave McKean, famous for his work on Sandman. But this might be more based on your music taste than anything else.
T_Mike:
Malachi Constant:
Bob Masse, for he too liked classic rock.
Embrodak: No clue who you are, sorry. So, uh, I'll assign you
Chax because Chax is always fun to look at.
Bunny Dracula:
Erwin Wurm, clever art at its worst.
yt:
Georges Seurat, because much like his Pointilist masterpieces, it's hard to peg one single element that makes you such a great poster, but all the elements add up to something extrodinary.
flyarz: I consider you one of my contemporaries. And since I've reserved the roles of Jean Arp here for myself, that makes you
Wassily Kandinsky.