The signs as The 100 Characters:

Aries: Marcus Kane

Taurus: Finn Collins

Gemini: Octavia Blake

Cancer: Commander Lexa

Leo: John Murphy

Virgo: Jasper Jordan

Libra: Monty Green

Scorpio: Clarke Griffen

Sagittarius: Bellamy Blake

Capricorn: Lincoln

Aquarius: Raven Reyes

Pisces: Anya