The 3rd of the celestial menagerie, is Gemini, with no obvious animal affiliation; the legend behind Gemini is that Zeus wanted a pretty little mortal thang, and disguised himself as a swan to get her (oh, that crazy Zeus), and the pair of eggs laid each had a set of twins in them. Long story short, one of these sets of twins (the mythos isn't clear on which) becomes the constellation Gemini after many heroic deeds.

The constellation is said to be represented by birds, but because birds are still a new-fangled beast to draw for me, I decided to depict feathery lizards, instead; on a side note, I've designated my characters, Ozzi & Izzi, with the Zodiac Gemini, and they are reptilian.

The weapon they've got is a pair of ring-swords, or large chakrams (a la Tira from Soul Caliber 4), and as you can see, what goes in one comes out the other. This is a constant connection, and cannot be turned off so long as the twins hold the other's chakram (otherwise, they are normal ring-swords).