Fusions
When two wizards have two Zodiac keys they can combine their power and two of their keys to summon their spirits as a single being. Some work better together than others whether it's because of their magic or personality. Combined spirits have double the power they'd have summoned separately and combine their abilities to gain new strengths. The two wizards share the drain of summoning both spirits and it's a Unison Raid of sorts so it's a rare occurrence.
Capricorn & Libra (Only because I'm bad at ship names)-The Goat of the Scales
Key Type: Gold Fusion
Appearance: It looks like a female version of Capricorn in a brightly colored pants suit with scales tied to bands on her wrists.
Personality: A very kind and compliant spirit. With Capriocorn's manners and Libra's obedience they don't talk much, but they're quick to follow orders.
Ablilities: Speed magic. They can speed up or slow down people. They can make themselves and their allies move at super speed and they can slow down their enemies. They can also increase the speed of an object so if they, for example, tossed a pebble and sped it up it could hit like a bullet. They're very strong and have a lot of skill fighting hand-to-hand.
Pisces & Aquarius-The Sea Dwellers
Key Type: Gold fusion
Appearance: A mermaid made entirely of water with two fish growing from her back like wings or tendrils.
Personality: Aquarius is a hard-to-fuse spirit because of her moodiness so they'd never completely fuse their personalities. It would be both of Pisces's personalities and Aquarius's just sharing a body.
Abilities: Their Water magic combines so that they can create water (like Pisces) and control it and any existing water (like Aquarius) and they can form their tail into legs if they want to fight, using water to help with their attacks.
Cancer & Taurus (Chorus?)-The Bull Crab
Appearance: Very lean and muscular. They wear light leather armor that's cow-spotted at the top and red at the bottom. They have long, fabulous hair. And they carry a sword in both hands.
Personality: Very flirtatious, but Cancer makes it more smooth and suave so they're more successful than Taurus is alone. They also love hair, and Taurus has made it a perverse obsession with womens' hair.
Abilities: They're super strong, fast and agile. They're experts in dual swordsmanship and can match the best swordfighters in the world in skill. Their combined speed and strength make them extremely hard to defeat.
Niú & Hǔ-The Striped Ox
Key Type: Red fusion
Appearance: A spirit that looks like a regular human man with horns and claws, wearing a tiger striped suit.
Personality: He takes the tiger's personality more and maintains his manners and gentlemanly behavior.
Abilities: He's extremely strong and uses his explosions in conjunction with physical attacks to make himself hit even harder. He's best for dealing with enemies with extreme defenses because if used directly it can cause severe injuries.
Cancer & Gǒu-The Dog Crab
Key Type: Red & Gold fusion
Appearance: A tan guy wearing a leather ninja outfit. He has a bladed fan in each of his hands.
Personality: He's over the whole ninja gimmick for the most part and acts very cool like Cancer does but every now and again the dog will make a surprised remark when he actually does something well and Cancer would tell him it's because they're so cool "baby."
Abilities: They're very good at using their bladed fans in combat and are very quick with Cancer's speed combined with the dog's wind. The wind magic is stronger and now they can create pressurized slashes of wind with the fans that can cut through almost anything or just hit with a lot of force.
Yáng & Aries-The Wooled Ones
Key Type: Red & Gold fusion (so are the next 3)
Appearance: They're both similar-looking so it would just be a pale girl with horns and a dress, gloves and a crown made of white wool.
Personality: They're a literally perfect fusion so they get along as if they were one being. Yáng's arrogance balances out Aries's timidness and vice versa so they're a confident, well-balanced spirit. They love to impress their summoners and they don't ever hesitate to move or make a decision.
Abilities: Hypnotic Wool magic. They use white wool that can be produced in much more small, precise shots or giant torrents than Aries can alone. When it touches a person they're hypnotized and placed under her complete control and have to her follow orders. This is mostly used to turn enemies against each other. It's useful but she has to be able to speak her orders so duct tape is her only weakness.
Lóng & Aquarius-The Stormbringer
Appearance: A woman that looks like Nüwa. She's half human above the waist and below she has the body of a serpentine Chinese dragon. She retains most of Aquarius's appearance but has grayish blue hair and white eyes. Her tattoo is also altered to be two lines that look like two dragons.
Personality: They do not get along and it's so bad that sometimes they separate and go back to the spirit world. Aquarius hates that he's such a "tree-hugging hippie" and he hates how she shows so little restraint with her magic, that she's so rude and that she's so disagreeable with her summoner. The only time they ever work in perfect unison is when they're both infuriated by an enemy wizard and really want to take him down or if their summoner is extreme, extreme, about-to-die type danger.
Abilities: When they're actually able to get along they can probably go toe-to-toe with the stone key spirits. They use the weather magic the dragon usually employs, but it's mainly focused around floods, storms, hurricanes, whirlpools that can strike on land and other water-related weather I don't know the names of. It's very devastating and they usually try to get their summoner to a safe place before going all out because they can't guarantee anybody's safety. Aquarius also likes how they can shock people that annoy her with mini lightning blasts.
Scorpio & Hǔ-The Clawed Scorpion
Appearance: They're human-looking with tan skin, black hair and orange eyes, and Scorpio's tail is now longer and is orange and black and they also sharp claws. They wear a black and red outfit with a trench coat.
Personality: They're very smooth and cool and a lot of girls go crazy when they see them when they're combined so hopefully Aquarius never finds out about that.
Abilities: Explosive Sand magic. They produce and fire sand that can be shot in all kinds of shapes and at all kinds of trajectories. They can make it with their hands but their tail produces the most. The sand explodes upon touching anything and one grain can dent a boulder so it packs a punch.
Zhū & Leo-The...I have no idea how to put pig and lion together
Appearance: Looks a lot like Leo but the suit is white and pink now with a black tie.
Personality: Leo takes the lead in this fusion because the pig is too busy admiring how slim he is in their shared body.
Abilities: Consumption along with Regulus. They use Loke's regular hand-to-hand combat skills but like to use long-ranged blasts more frequently now. They can also consume attacks to strengthen the power of Regulus. The magic attacks they consume (if they're elemental magic) can be used to add special effects to Regulus. So fire would make it burn, earth would make it hit harder and that kind of thing.
Libra & Cancer-The Scaled Crab
Key Type: Gold fusion
Appearance: A tan woman with black hair and brown eyes. She wears black armor with gold accents. She also has ten very large, very sharp shards of metal that surround her at all times.
Personality: She's very quiet, but not as much as Libra. She just prefers to demonstrate her capabilities rather than speak.
Abilities: She telekinetically controls the shards of metal surrounding her during fights instead of wielding them with her hands. She's very quick with them and can control all ten as if they were one so there's practically no such thing as a numbers advantage against her. She also moves very fast and can avoid attacks long enough for her blades to do their work. For her most powerful attack she shatters all the metal shards and has the shrapnel whirl around all their opponents like a blizzard. That destroys the blades though so after that she can't be used anymore.
Shé & Gemini-The Twin Serpents
Key Type: Red & Gold fusion (so are the next 4)
Appearance: Two gorgons who are joined together at their snake tails. Kinda like CatDog. One is male and the other is female.
Personality: They're more serious than Gemini and speak a little less but sometimes they make snake puns.
Abilities: Wizard Soul Take-Over magic. They can absorb any wizard's magic by touch and use it expertly. They can also mimic the wizard's appearance if they want but it's not required.
Māo & Libra-The Cursed Scales
Appearance: A guy that looks like Māo but wears a lot of gold jewelry and wears bright colors.
Personality: They're very quiet and Māo is more mature so he focuses less on pranks.
Abilities: Chaos magic. They can create natural disasters, cause earthquakes and can create waves of crushing force. It's not best to use it in an area that you don't want to be damaged.
(AN: I'd do Shǔ and Capricorn, but what does Capricorn have to offer? Sunglasses? Poetry? A tailored suit?)
Taurus & Niú-The Bovine Bruiser
Appearance: A minotaur that's solid white instead of spotted. He carries an ax in each of his hands.
Personality: He's more respectful so he's not as blatantly perverse as Taurus but he does just stare at women without saying anything which is a lot creepier.
Abilities: They have strength on par with Mars. They can lift almost anything and when they bang their indestructible axes together it creates a shockwave that can travel far distances. They can hit the ground with the flat part of the axes to create an earthquake or with the hard part to alter the structure of the ground or hit people underground.
Hóu & Pisces-The Monkey Fish
Appearance: A humanoid monkey with scales instead of fur and a red scaled outfit. They have a double-ended trident that they wield like a staff.
Personality: They have a good sense of humor and like to tell jokes. It's a little hard for them to take action because it's three voices and personalities working in their mind and voting on what to do.
Abilities: They use Hardening and Water magic. They can harden themselves or harden the water they create to make little jets and waves that hit with force as if they were solid.
Virgo & Mǎ-The Stonebearer
Appearance: A very beautiful girl with sandy hair and brown eyes. They wear beige but it's still a maid outfit.
Personality: They're very overzealous about protecting and serving their summoners and will go to unnecessary lengths to do what they're asked to. For example if they're asked to help their owner cross a mountain range they'll shatter a path through the mountains which would probably result in all the mountains collapsing from the lack of structure.
Abilities: They use Earth magic. They can use Diver to move much faster and they can also just manipulate the earth with extreme skill, power and versatility.
Holly & Saggitarius-The Golden Horse
Key Type: Green and Gold fusion
Appearance: A centaur. The horse half is made of metal and the human half doesn't have the horse costume anymore. They carry a large bow and have a quiver of metal arrows.
Personality: They only have Saggitarius's personality since Holly doesn't have one.
Abilities: They're even more skilled when it comes to archery and can shoot up to four arrows a second with extreme accuracy. They never miss. They're also able to easily reposition since they're as fast as a horse and they can aim accurately while moving. They are also made of metal from the waist down so they're harder to harm.
Yáng & Aquarius-The Enchanted Waterbearer
Key Type: Red & Gold fusion
Appearance: A woman with a white fish tail and a sea foam material bikini top that looks like wool. They have white hair and blue eyes and the urn is more of a lyre now.
Personality: They're very hard to control because Yáng's arrogance and Aquarius's anger don't make for someone who easily does what either of their summoners say. The only way to get them to act is to make them very mad at any enemies or to use Yáng's need to be the best against them.
Abilities: They sing a magic siren song that drops the guard of everyone around them and enchants them to do whatever the two of them say. They can also manipulate huge amounts of whatever water that they create that mixes the raw power both of them have.
Xióng Qín & Saggittarius-The Feathered Horse?
Key Type: Red & Gold fusion.
Appearance: This is just so hard to combine I can't even imagine what they'd look like.
Personality: They're very boastful about their skill as a marksman. If they ever miss a single feather they'd probably have a mental breakdown.
Abilities: They can shoot feathers that generate from their body naturally like arrows. They also have skill in hand-to-hand combat so they can excel at close and long range.
Aries & Leo-The Wooled Lion
Key Type: Gold fusion.
Appearance: It looks like Loke with horns and a pink and white suit.
Personality: They like to talk to each other a lot and will forget the task at hand if it's not important just because the two of them like to be able to share their thoughts and speak to each other like that. They're extremely devoted to their summoners and would do anything to protect them.
Abilities: They use Light magic. The light can either burn hot and harm people like Regulus or it can soothe them like the wool does. They're also very strong and good in combat.
Scorpio & Aquarius-The Sandbearer
Key Type: Gold fusion.
Appearance: They are a pale guy with a merman tail that turns into a stinger towards the end. They wear a lot of jewelry.
Personality: Scorpio gives Aquarius the reins until she starts to let her emotions jeopardize their summoner's safety. Then he either calms her down or he takes control while she cools off.
Abilities: Clay magic. They can control and create clay that they can keep in its liquid form or dry so that it's more like solid stone.
Shǔ & Gemini-The Twin Rats
Key Type: Red & Gold fusion.
Appearance: Two young versions of Shǔ that are always holding hands.
Personality: They love to sneak around and scare people or steal things.
Abilities: They can use Copy Magic to become anybody they want without a limit on power since the rat's Theft magic gives them an extra boost.
Willow & Taurus-The Great Bull
Key Type: Green & Gold fusion.
Appearance: It's just Taurus but his fur is solid black. He also has eyes made of burning red fire and the ax is even bigger and sharper.
Personality: He's very violent and aggressive now and loves combat. But he can't bring himself to harm women.
Abilities: He's much stronger than Taurus and has Berserk magic so he can't be sent back to the spirit world by injuries as long as he keeps fighting.
Elder & Saggitarius-The Winged Archer
Key Type: Green & Gold fusion.
Appearance: A man with blue wings and black hair. His bow and arrows are solid lightning.
Personality: They have Sagittarius's personality.
Abilities: They use Lightning-make magic to a bunch of arrows made of electricity.
The Celestial Spirit King & Queen-The Rulers of the Sky
Key Type: You have to sacrifice all 4 stone keys. Once you sacrifice them you can never make a contract with them again.
Appearance: Half their body is a glowing man and half is a woman made of shadows. There's a giant crown on their head that's made of darkness above the male side and made of light above the female side.
Personality: They work extremely well together and don't show a personality much because they try to get whatever they're summoned for done quickly because they drain such a life-threatening amount of magic power.
Abilities: They can fight using purifying light that burns anyone with wicked intentions to dust and darkness that negates someone else's magic entirely. They can also "split" apart without becoming unfused and send a man made of light to fight with a sword and a woman with a bow to fire a bunch of arrows from range.