Medusa has gotten enough support to justify discussing her. I like her mainly because she's a classic. Again, we need to think about our artistic inspiration. We also have to talk about how we want her to work. A straightforward D20 Medusa isn't nearly powerful enough to be a Titan, so we need to decide how to up her power.

Should we make her stone gaze super difficult to resist?

Should she have a snake tail and get attacks with that?

Should she use a bow? Should her arrows be poisoned? If so, how poisoned?

Should she regenerate?

I think the D20 version is a good base, but it really needs beefed up to make her a Titan.