In the code you just posted, you included 225 as the transparency. This will make the player *mostly invisible* as 255 is the max value. Is that what you wanted?
As for your first code example, you were using v: when you never declared v in your code. You did for _, ply in pairs.. which is fine, but then your player object is stored in ply, not v. You kind of mixed two standards which led me to believe that you put that example together by looking at other code, not really understanding what it did. It was close, but wouldn't have worked, which is why I wrote it out and commented it for you.