Hiro: Libra (October 19th)

Len: Gemini (June 2nd)

Ximena: Aquarius (February 1st)

Kyro: Taurus (May 13th)

Nightingale: Gemini (June 2nd)

Vala: Leo (July 28th)

[The pic above doesn't belong to me. Now you know their birthdays!]