Trying to define the perfect submissive would be like trying to objectively decide the single best flavor of ice cream. Because everyone has different tastes, it is just not possible. I can't tell you what makes the perfect submissive. But I can tell you what I enjoy. If I were to write an ad looking for a submissive (and no, I'm not actually looking), it would go something like this:
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Seeking:
Intelligent, sweet, witty, whimsical, content with simple sacrifices and offerings made in her name such as poetry whispered in the dark;
worships in a glance, sings in the shower, walks in the rain;
unafraid of words and what they mean, gets caught up in an idea, a voice, a moment, devious, stubborn, beautifully self-absorbed, divinely giving;
as desperate in her hunger as she is coy in the chase, petulant and bratty, intensely driven, wildly exploring, somewhat domesticated, submissive.