Overall i agree there are a lot of Evolved Character who don't look good, IMO, in comparison with their original art. The one for who I am really sad is Bipina Cosmos:

I don't like this artwork, I prefer her original look:

...while she's so cute in her special scene:


But there are exception as already mentioned, my favorite is Marigold:
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Both arts are great but I can feel the change in her strength after Evolution.
Too bad her sprite is the one with a bikini... while her artworks are really more dignified/classy/...