Now, please, never ask this question again so I don't have to make another post this freaking depressing.
The LP seriously missed its moment here. Had they settled on a major celebrity candidate with huge likability and social media savvy, they could be sweeping up the Bernie defectors (I know it makes no logical sense, but Bernie bros don't) as well as disaffected independents.
Louis C.K.? Is he a Libertarian?
As much as I love Louis C.K., I don't think #CK4LP would work. But I'd show up to all his rallies with an "Awesome Possum" shirt on if he did. Doug Stanhope (who was on a great episode of
Louie) is libertarian, of course, but doesn't have the name recognition for the type of candidate you're wanting.
I get what you're saying, but this "celebrity" needs to be an actual libertarian, and not a publicity stunt. Trump, your example, is doing well, but he's alienating 80% of the country. He won't win. To get enough to win without the mass of zombie voters who devoutly support a major party in this "lesser of two evils" world, you need a very, VERY good candidate. Someone who can make the case that they can lead the country, and that their ideology is better than the other two. I doubt any mega-celebrity candidate can do that. Honestly, Johnson and McAfee are probably the best at that--Johnson with the former, McAfee with the latter.
The LP can bring in some Cruz defectors if Trump wins, and/or Bernie defectors when Clinton wins. They could even do both, but not in large enough quantities (since a candidate that would max out one--say, Austin Petersen for the Tea Partiers--would suck at the other).
Now, you want celebrity libertarians? Jimmy Wales and Elon Musk immediately come to mind, plus the guys Sparkey mentioned. But, again, while a celebrity would generate media coverage, to get votes without built-in machines I think you need a political office on the resume (I know he's awkward, but Gary Johnson is FAR more qualified than the top two candidates in either major party).