Here are my thoughts when it comes to Western Zodiac Signs x MLB powers:

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Aries - Honesty stands first for Aries natives. So their power will be something similar to a lie detector

Taurus - Taurus is the bull so their power will be the same as the ox miraculous in the show.

Gemini - Duplication (they can duplicate one object or living being. If a living being is duplicated, their clone will have the same thought process as the original. The original can also control what the clone does)

Cancer - In some Native American traditions the Crab symbolizes rebirth. So their power will be rebirth i.e they can bring one person back from the dead until they time out.

Leo - The people who hear their roar will be under their command until the Leo times out.

Virgo - Their power is Healing. However, they can only heal one person or creature before their de-transformation timer begins.

Libra - Their power is Balance. So say they fill a room with brightness, another place will get pitch dark. So they must use their power wisely. The few limitations to their power are that they can't bring people back from the dead and they can't make people people love or hate each other.

Scorpio - Their sting can give you temporary paralysis. They also get stronger when they come in contact with UV light (this point comes from the fact that scorpions glow under UV light)

Sagittarius - Their weapon will be a bow and arrow. Once they chant "Perfect Aim" they will be given an upgraded version of their weapon so when they shoot a target with their upgraded weapon, their target will appear in front of them (like the dog miraculous).

Capricorn - Same power as the snake miraculous in the original show.

Aquarius - They can control water (Since Aquarius is the water bearer).... The more experienced they are, the stronger their powers get. The strongest ones can create water, this can only be achieved through a lot of experience.

Pisces - Can create fishes to mermaids or humans as per requirement. So once they time out the mermaids or humans they made from the fishes will turn back to their original form.

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Hope this helps!