"I AM SMURF,I DONT SUPPORT YOU!" Goes cho gath support.
"I HATE CASUAL SUPPORTS,MEEEEH" Goes blitz and builds manamune
"YOU FUCKIN RETARDED FIRST PICK,I AM AD" Goes soraka and starts with silence.
"quest where is vayne's guide
vayne needs armor pen m resist armor and physical dmg ^^"
Not really,every ad player has it's own style of course,But with vayne you won't need ar.pen,atleast early game.Since your hits won't do dmg anyways,except if they proc with Q.In vayne's playstyle is to make sure you land the third hit,while 16 ad is good for doing a decent amount of flat dmg,in order to give a third more painful hit.