The Amazon Trio were: Tigers Eye, Hawks Eye and Fish Eye [there should be an apostrophe in their names, just before the 's' (it's Tiger's Eye, not Tiger Eye!) but i think they look better this way]. They were working for the the Dead Moon Circus and were under the commands of Zirconia. Each of the Trio members was a unique character with an amazing personality. In my opinion they were the best male villains of Sailormoon. Why that? For various reasons: fisrt of all they were all looking gorgeous, not only when disguised but also when wearing their normal clothes. Then it's the way they used to lure their target. They were popping up pretending to be beautiful strangers and were trying to win her/his heart (their acting was so funny)! Their conversations and quarrels about women were endless.
One must not forget though that the Trio were villains. They looked happy because they were acting according to a plan. They were following their orders closely and most times reacted violently (especially when their target rejected them)as they lacked feelings like love, friendship or sympathy. They also had no hesitation killing their targets when they didn't have what they were looking for. However, no one can blaim them for their cruelty. It wasn't their fault that they had no feelings, nor it was their choice to follow Zirconia's commands. Nevertheless it's that combination that makes them so cool. Beautiful and kind on the outside but cruel and mercyless inside.
As mentioned above the Trio was obeying Zirconia and they were obeying him blindly as they were afraid of him. He was the one who gave them their human form (of course Neherenia provided him with that power). Before that they were animals: Tigers Eye was a tiger, Hawks Eye was hawk and Fish Eye was a fish. Their mission on Earth was to find Pegasus, who was hiding in a beautiful dream. Only near the end of their lives did they learn about the power hidden in Pegasus' golden horn but still couldn't understand why Zirconia needed that since he had enough power to take over Earth (Zirconia needed the golden crystal to brake the spell that was keeping Neherenia trapped).
Their technique was simple: Zircon (the flying eyeball) provided them with pictures of people who had beautiful dreams and the Trio were choosing the person that looked more likely to hide Pegasus in his/her dreams. That person would be their target. Then one member of the Trio was attacking the target and checking if Pegasus was there. Generally Hawks Eye was attacking older women, Tigers Eye the younger ones and Fish Eye men (as you can see they were attacking according to their own preferences). The first part of the mission was to lure their target. They were approaching their victim disguised (actually they were quite recognisable even under disguise) and were trying to pull him out of the crowd usually pretending to be lost or in love with him/her or trying to help or even pretending they were dying (Tigers Eye had always been the best in acting). The second part of the mission was the dream mirror extraction (every human was said to be carrying a dream mirror that reflected his/her dream). After changing to their circus clothes they were using the 1-2-3 trick to pull out their target's dream mirror. By saying ONE a table was appearing behind the victim. By saying TWO handcuffs were strapping the victim on the table. Finally by saying THREE the person's dream mirror was coming out of the person's chest. At that moment Sailormoon and Chibimoon were appearing and were trying to stop the bad guy (of course they were never forgetting their speech before they attacked). The Trio member was then spawning a monster using his shadow (these monsters were creatures of the circus and i think they were called remless but i don't know what it means). While the senshi were occupied fighting the remless the bad guy responsible for the mission was checking the target's dream by putting his head into the dream mirror. The mission was always succesful but the Trio never found the person that was hosting Pegasus in his/her dreams (and that person was Chibi Usa) as the targets they attacked were wrong. This pattern (luring the target, 1-2-3 trick, remless Vs Sailormoon and Chibimoon, remless defeated) was repeated in all episodes starring the Trio. In a few episodes the Trio themselves attacked the senshi before spawning the remless.
Each character of the Trio was different from the others and so were their opinions and ideas (and i'm not talking only about subjects concerning women). They used to make fun of each other for those ideas. Hawks Eye and Tigers Eye were disgusted by the fact that Fishy Eye liked men and then again Hawks Eye and Tigers Eye were always fighting about the age in which women are better. All these fights, discussions and the Trio's strange ideas were VERY funny and are one of the reasons that the Trio are so popular (those jokes actually make the whole series worth viewing). Something else i cannot understand is their experience concerning women. They seemed to know every existing type of women and they were very good in flirting. My question is where did they learn to flirt (since they were animals before)? When not on a mission the Trio used to hang around in a bar, inside the circus. The bar's decoration was really simple, just a bench, some stools and the circus logo made by neon lights, but the Trio seemed to enjoy passing their free time there.
Their clothes were really bizarre and generally their appearance wasn't quite normal. Some say they looked like freaks but i think they were just dressing a little different (and quite modern). Their jewelry was freaking too. Tigers Eye (he had the wierdest appearance of all three) used to wear a gigantic necklace and his earrings looked like razors, Hawks Eye was wearing something that looked like a collar and Fish Eye had long earings and a strange uniform. All of them were wearing high heel boots or shoes and had a jewel on their forehead and makeup on their left cheek.
The fall of the Trio begins on episode #144. It is then that Tigers Eye learns about something called friendship and he is amazed by Ami's effort to save Shingo. His amazement lasts just a few seconds and then he returns to his normal cruelty but this is the first sign that the Trio begin to think deeper about their life and their mission. It is again Tigers Eye who, on ep #147 hesitates about attacking Makoto and for a moment he even feels sad but again he recovers quicly and proceeds with his mission. Meanwhile, Zirconia, aware of all this knows that the days of the Trio are almost over. He doesn't need servants who think, thinking always creates questions, questions to which he has no answers. Finally it's Fish Eye's turn to understand the truth about their nature (they aren't humans) and also fall in love with his target Mamoru. Zirconia activates their termination plan, and after a short battle they all lay dead, killed by the remless Pierrot.
However there was a happy end in the story. Since the Trio turned good
in the end (Fish Eye convinced the others that Zirconia was using them
and in the end decided to use the energy ball that was supposed to
help them get their own dream mirrors, to save Sailormoon) it wouldn't
be right to let them die, so Pegasus not only gave them dream mirrors but
also allowed them to live in his forest (now how would three guys live
all alone in a forest, especially when they are so depended on women, is
another thing).