What's so frustrating about Ridley being dismissed by Sakurai is that there really isn't another rep that works that hasn't been eliminated (i.e. Dark Samus). The only other person from Other M of note is Anthony Higgs. I'll be honest, I REALLY didn't like Other M, so my opinion about him being included is extremely biased. Then again, "I'm gonna teach you a lesson about subtlety" made me die laughing at the irony. Maybe that could be a taunt.
I think what makes Metroid reps so difficult is that aside from a select few characters, almost all of them are giant monsters. I know that characters can be scaled and all, but only within reason. Ridley could probably work, but I'll admit that it would be a challenge.