Mm, nice question :’)
Aries - They would probably show off their best selves, they would be flirty, and just be themselves, their usual fearless, strong, confident selves.
Taurus - They would show their kind nature, they usually would stare a bit, blush, giggle, just little signs that show directly to them being attracted to the person ocrushing on them.
Gemini - Geminis could approach them, wink at them, smile, communicate and show a lot of gestures.
Cancer - Ah, they are so cute, sh, they would probably try to continue minding their own business, but would not help it, they are naturally sexy, they have that natural aura and beauty - of the Moon.They would blush, but look away at the same time.
Leo - Doubled confidence, doubled drama, lots of pride though.
Virgo - Aww these cuties, they really are people who love to keep their feelings to themselves, and appear cold.But they get really excited when they see someone attractive just their crush, sweaty palms, cute eyes, you could see it in their eyes.
Libra - Flirtatious, immediately engaging in conversation if they have a chance, check their hair, over all they check their over all look.
Scorpio - Ah they stay damn mysterious, they could stare a lot though, lick/bite their lip.
Sagittarius- They are full of energy, so they might do something silly but interesting in front of them, but also do the ‘damn boy/girl’ lol
Capricorn - Will try to keep their cool, and of course their infamous serious face, so it will be hard for the other person to read them
Aquarius - Fluffy, bubbly, but still with the fire of a rebel, they will keep their cool, but also give out small signs, small inner signs that they are aware they do in front of that person.
Pisces - Melt, literally melt lol, bury themselves in their pink cheeks, have those cute anime eyes, similarly like Cancer but even more heightened.