Gemmakante was introduced on 2 December 2004, so he's five today! They grow up so fast.
Other birthdays, for reference (mostly from the cast page):
17 Jan: James
11 Feb: Ethereal
1 Mar: Fatima, Antonio, and the whole comic
2 Mar: Aileen, Maxwell
29 Mar: Path, Kev, Hiro, Sal, Elder, Dirk
31 Mar: Some Guy
5 Apr: Valcalcia
12 Apr: Malbez
14 Apr: Araceli
21 Apr: Xantrich, Pyre, Taurdian, Tnacult
30 Apr: Shin
8 May: Zenobia
11 May: Exor
21 May: Aria
25 July: Aramande
29 July: Amena
10 Aug: Reza, Germ
20 Aug: Cress, Alexander
23 Aug: Solaria
10 Oct: Milliene
2 Dec: Gemmakante
21 Dec: Elm
27 Dec: Talon, Fluffy
29 Dec: Maple