Through the Force, Luke can sense other beings and at least their surface emotions, if he tries. Plus, sometimes, if they're speaking the truth or not - if you'd rather he not be able to do this (one or the other, or all) to your character(s), just drop a comment here.
Also, regarding fourthwalling: while it's all right if he's recognised, I'd rather not it be any more than that, so please don't bring up that he's a fictional character in your reality or anything such.