I think it's more like they enjoy reproducing motifs. Code Geass characters are not their characters, strictly speaking, but resemble CLAMP characters in this image because of several motifs that CLAMP frequently uses: hair draping over arms, regal/asian clothing, birds, swords, flowers, etc. They have a certain kind of image that they like, and they make that image a lot. But what's wrong with that? I think every artist has their own "calling card" so to speak ^_^
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