Footloose: This person gets barefoot as soon as possible aboard public transportation. Feet up on the seat in front of them for all to enjoy. Even better if the feet has all the colors of a Civil War bandage. Extra credit for food odor.
Pajama Boy: Yep, wearing or changing into pajamas or some other bedtime apparel. This is fine for kids. Adults? C'mon. Extra credit if the clothing is revealing. Really, nobody needs to see that.
Mr. Sandwich: Brings on some particularly smelly food like an Italian or tuna fish sub, allowing us to vicariously enjoy at least the smell of it. Extra credit for loud eaters and those who somehow make a big show out of eating.
The Bullhorn: Some people are genetically gifted with voices like a verbal blowtorch. You can hear them laughing or holding forth almost anywhere on the plane, and who doesn't enjoy hearing their pontificating on life?
The Know-It-All: This person may be combined with The Bullhorn. They know everything and want you to know they know everything. They are quick to raise their hands or blurt out trivia questions from the tour guide. Good for you! You may have also experienced this person standing in a movie ticket line. During bus tours they are like annoying assistants to the tour guide, providing their own expert commentary until you want to choke them.
Stinky: Folks, please, is it asking too much to take a shower before boarding public transport, especially in August?
Mr. or Ms. Cologne: What can I say? It's like someone took a bath in perfume or after shave. Extra credit if combined with BO, which is the worst human duo of smells on Earth.
The Leader: The guy or gal who decide on their own to be unofficial tour leaders. This is fine by me as long as they don't mind me ignoring them.
The Heavy Accenter: Probably not a real word, but just go with it. This is a tour guide that often has people looking at each other with the "What did he say?" look. It was probably something very interesting, but at the same time you might feel rude if you ask him to repeat it, and when he does you're still not quite sure what he said. You might ask the person beside you to interpret, and sometimes this works!
The Late Guy: This might be the worst, and is either one person or a clique of people who are always the last ones back on the bus, often late and sometimes very late. I had one tour guide that berated a couple of them and while it was a bit startling, by golly it worked! The guide vowed to leave those who were late from then on and miraculously everyone showed up on time. Funny how that works. (I had a tour guide who told some great stories of leaving people behind, luggage and all, which I wish would happen more often, at least after the first time they're late.)
The Clipper: Someone who decides the plane is the right place to trim fingernails and toenails. Extra credit if they apply nail polish or other grooming chores.
The Talker: It can be a risk striking up a conversation with someone sitting nearby. I'm not anti-social but after a few minutes of discussing where someone is from and where they're going, I'm good. Of course there are exceptions. Unfortunately for some folks this can lead a story that has no end.
Did I miss any?