Alright so in my game OHOTSS it will be an elementary system and so basically you can use some element for combat (ice,snow,Fire,Rock and Wind) and I'm going to give you everyone of them so:

Elements

Ice and Snow beats Wind, Wind beats Fire, Fire beats ice and snow, Rock beats ice

There's also some others elements like water or thunder but the player can't use it (only the boss/alies) and for the weakness we have:

FB-01 (first fight)=NONE

Cancerous=Ice

White Pegasus=Fire and Rock

Sagittarius=Fire

Red Torus=Wind

Scorpio=Wind

Green Dragon=Ice and Snow

Geminigirl=Snow

Aquarius=Ice

Capricorn=Rock

Fish Zodiac=Ice

Virgo=Wind and Snow

FB-01 (second fight)=Snow and Rock

Aries=NONE

Andromeda Bloopy=Ice,Snow and Fire

Constellation Killer=NONE