Anti-meta/Skill Drain (Pretty Princesses) This is the category I fit into and I've known others in my life that were in this category. I'd say these people tend to have superiority complexes although they might not show it outright a lot of time. These people also tend to be outspoken and try to help out others. You either love them or completely hate their guts.
Lightsworn (Twinkle Fairies) These people appear quiet when you confront them but open up the more you talk to them. Once you become their friend they will be loud and confident around you.
Gladiator Beasts (Gay Boys) They are not gay literally. Although they tend to be more flamboyant then others. They are mindful of the way they dress and sometimes have a love affair with their hair. Are smarter then most although you would not expect it at first glance.
Six Samurai (Tall Dark and Handsome aka TDH) These people are usually reserved. Most have a nice smile. Even though they dont express it annoyingly, they think they are an amazing player. Usually the type of person that blends in the crowd but they are nice people to talk to unless you are playing them. Then, they'll just give a smug mean smile when they special summon their whole hand.
Gravekeepers (Pretty Hoe Bags aka PHB) These people vary the most compared to every other group. Usually they are swayed easily. You can convince them to do want if you know how. Usually with a compliment or two. They love compliments about their attitude and can be kind of a schitzo sometimes. Most of the time, these people will be calm but can snap when really provoked. It takes a while to get their confidence, but when you do, you'll have an awesome friend.
Stall/Final Countdown/Burn (Ballerinas) These people try to act like they're "pro" all the time. But although some might be nice people they are insecure about certain aspects of their life. Many of them may be socially awkward. Also, from personal experience, I've noticed that many of them have funny sounding voices.
Updated Part 2
Black Wings (Chickens) The name "chickens" has nothing to do with their personality, Its just what I call Black Wings xD. These people are always confident in their playing ability. But most of the time they wont be the people who stand out in a crowd. They will sometimes try to make up for the blandness with catch phrases but it usually ends up backfiring. xD But, they don't really have to do it. They're likable as they are. :)
Monarchs, Any Variation (Squishies) These people are hard to decipher. Sometimes you can't even begin to even contemplate what comes into their mind. Not very talkative at first but will gradually increase in conversation. Sort of a weirdo, but usually not mean or unlikable.
Spellcasters, Any Spellcaster Variant (Bubble Sparkles) They tend to contradict themselves. Will say one thing and do another sometimes without even noticing. But, they mean no harm and just want to have fun. Sometimes hard to warm up to but it just takes time. Once you see past that wall of weirdness, you'll see that it was uniqueness.
Synchron (Toasters) These people, if under the age of 20 are sometimes unaware of their surroundings and can be very care free. Usually friendly and rational people unless provoked. If over 20, they will most likely be the mature type of person that you can easily look up to or ask for advice when you need it.
Fabled (Moose) These people will try their hardest not to invade your space or privacy. They are pretty "chill" when you duel them. And if you talk to them they'll try not to get on your bad side. They usually don't have enemies and are they laid back peaceful type of person.
Gadget/Machina (Pink Socks) These people are the fun person you would call "stupid" but they are fun to be around. Sometimes are not the best losers but they will gloat about a victory. Although they have a personality that is sometimes out there you can't help but like them although you don't. Love-hate relationship.
FINALLY! Part 3 :)
Dragunity (Oranges) These people are the lovable person in the group. They love the opposite gender and completely respect that opposite gender. During a game, they have a quiet but confident aura about them. And, outside of the dueling atmosphere they will be slightly more vocal.
Karakuri (Squigglies) These people are very mysterious. You usually don't know much about their personal life unless you ask directly. If over the age of 17, 85% of the time they will have a significant other tucked away somewhere that others might not have known about. During a duel they are mostly quiet, but very offensive.
Plants (Pretty Flowers)These are people that also blend into a crowd sometimes. When you play them, they are friendly. Also, they might try not to spend too much money, but if the opportunity arises,they'll spend more then they initially wanted.
Zombies (Creepies) These people can be complete weirdos in some aspects of their lives. They trade when they have to, but sometimes can be sort of a pack rat. They like to hold on to things as much as they can. They try to be as offensive as they can, but can sometimes come up short. They are mostly nice people but a small percentage may have an evil side to watch out for. Patient overall.
Counter Fairys (Angels) At first these people will be somewhat on the quiet side, then, this is when they will take the time to decide if they like or hate you. With these people, most of the time there is no in between. If they decide they hate you, watch out. Depending on the person, retribution may come differently. And if they like you, they will talk to you to no end.
Scraps (Gnomes) These are the intellectuals of the group. They tend to always be on the smarter side of the spectrum. I would describe them as the "lovable nerd" that you cant seem to hate. They are smart, but never obtrusive with their knowledge. For the most part, these people do not make enemies easily.
Once again, thanks for reading what I have to say. I love the responses so far, and plan to do a part 4 for all the decks I probably missed.... like E Heros. So, look forward to that and more in the next installment of the Yugioh Horoscope :) As always comments are appreciated, so go ahead ;]