Okay, so all twelve Horoscopes have been revealed as of this point, the last being Pisces (my sign <3 all of my feels). Let's review them, shall we?
Scorpio: The Constellation of the Scorpion. Notice how she's more proficient in kicking attacks than anything else, like a certain Rider. She can sting people using the scorpion tail on the back of her head and release a deadly poison that could nearly kill them. Her Supernova is a giant scorpion. Don't really remember much out of it, though.
Libra: The Constellation of the Scales. His talents lie within his illusions, taking on the form of various people such as Kengo, Yuuki, Tomoko, and even Fourze himself. Just as his illusions can fool, so can his tongue. Kouhei Hayami, whose actor once played Kamen Rider Garren in Kamen Rider Blade, has kept his identity hidden for so long from his students and peers at Amanogawa, being the main enforcer who distributed the Astro Switches and swore undying loyalty to Gamou (even to his very end). Unlike his fellow Horoscopes serving under Gamou such as Leo, he's not very strong physically. His Supernova ability is called the Eye of Laplace, which allows him to easily find the remaining Horoscopes out of the students of Amanogawa.
Virgo: The Constellation of the Virgin. His identity has been kept secret for so long, and many guessed him to be a woman (I mean, look at the Zodiarts for god's sake...it was kinda disturbing). His abilities include warping and creating Black Holes. Despite his appearance, he is actually physically strong, being able to keep up with Meteor's Limit Break and able to tangle with Meteor and Fourze at once. Despite his loyalty to Gamou, Virgo is actually the supplier of Meteor's powers and the "benefactor" of Kengo's Gate Switch to the Rabbit Hutch, "Tachibana", playing as a double agent in the hopes of finding someone he can team up with to take Gamou down.
Leo: The Constellation of the Lion. As the bodyguard of Gamou, Tatsugami must be strong enough to protect his master. Leo is a superb martial artist with more loyalty to Gamou than any of the Horoscopes. For the sake of his master, who will do whatever he deems necessary. Strong by himself as the Leo Zodiarts, Tatsugami can also transform into the other fallen Zodiarts such as Scorpio or Virgo and use their powers just as effectively, probably even more than the original users, and must be considered a force to be reckoned with.
Cancer: The Constellation of the Crab. Cancer's claws are as sharp as his tongue. While his claws can cut through any substance such as Fourze's Shield Module (I think that's the right word for it), his words can easily mess with his opponent's psyche and can cause them to slip up. His body is one of the hardest of the Horoscopes and can withstand a good amount of attacks. His Supernova form allows him to become a giant crab. Cancer can also steal the souls of other people that take the form of rings. By severing the rings, he can kill them or put them in an eternal coma.
Aries: The Constellation of the Ram. Being the transfer student that switched with Sakuta Ryuusei, Tatsumori controlled the entirety of Ryuusei's old school in a tyrannical way by putting his victims in a sleep that is considered beyond dangerous. This sleep can make a body forget how to live and cause it to shut down to even the point of death. However, he can also reverse this option as he did with Ryuusei's comatose friend, Jirou. While not physically strong, his sleep aura is something that should be avoided.
Capricorn: The Constellation of the Goat. Capricorn is a complete metalhead with his weapon of choice being an electric guitar. This electric guitar granted JK the ability to sing, which combined with the Zodiarts' ability caused his listeners to go wild over them. This extreme burst of energy then causes them to shut down, even to the point of hurting themselves. His Supernova ability allows him to resonate with all the Switches in Amanogawa, including the Horoscopes switches, and especially the Core Switch.
Aquarius: The Constellation of the Water Bearer. Aquarius isn't exactly physically strong, but her whips are sentient. By severing a piece of the whip, she can find the missing piece as a form of reconnaissance (though this was mainly used by Leo). Her main ability is to use her waters from both vases on her shoulders to heal herself of any damage or heal anyone else of injuries or fatigue. Despite her friendship with Gentarou and the others, she chose Gamou first.
Taurus: The Constellation of the Bull. Taurus is effectively strong as an individual and rules Amanogawa with an iron fist as the acting Student Council President. His main ability lies in stealing the souls of other people, including Meteor himself, and forcing them to become his mindless slaves.
Gemini: The Constellation of the Twin. Gemini is a special Zodiart; she takes on the form of one's darkest desires, which unfortunately Yuuki became the target of. The longer she exists, the more of Yuuki's memories and life energy is taken. Eventually, Yuuki nearly forgot who she was until Gentarou reminded her of their childhood promise. Gemini is an explosion artist that can use Red Cards as throwing bombs or Blue Cards as detonation bombs. Her Supernova form allows her to form a second clone made of explosive Cosmic Energy. In essence, the clone is a dangerous living bomb.
Pisces: The Constellation of the Fish. Pisces is the last Zodiarts revealed, but takes time to awaken. As Libra states, "the owner of the Switch must transform into Pisces out of his or her own will." The user proficient in Aikido, Pisces is surprisingly physically capable and is able to blend and swim into any body of water; this allows her to hit and run.
Sagittarius: The Constellation of the Archer. The most powerful of the Zodiarts, Gamou becomes the archer that will ascend above all. He radiates a burning flaming aura and can fire a single flaming arrow or multiple at once. Being the boss of the Zodiarts, he is also one of the strongest, even more than Leo. The extent of his abilities are to be seen in future episodes.
Which of these Zodiarts do you like the most? Character wise, ability wise, etc. I find my favorite in
Scorpio because of her fighting style, which I can relate more with myself. Just as (Yaguruma) TheBee and KickHopper are my favorite Riders overall because of their kicking-based fighting style, Scorpio also mimics the same pattern.