Gragas

「Others use eyes to take in scenery; he uses his liver to check in. Sights can be skipped, the drink menu cannot.」

You thought this was a vacation, he thinks it's a global alcohol-concentration survey. Every street is just bar signs to him, every map pin is a liquor store. Others research itineraries, he researches Happy Hour. By the end, what runs in his veins isn't blood — it's an over-the-limit DUI ticket.