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Red's simple, but alright. I like his original and SM designs more than FRLG though.
Ethan was perfect in GSC, but I don't like his HGSS design nearly as much and usually play as Lyra instead in HGSS as a result.
Brendan's design was okay at first, Emerald was a mess with fucking shorts over slacks, ORAS was close to being perfect but the color scheme is off. Make the shoes and bag yellow and the shades of red more like his RS design.
Lucas was awkward even if it was apparently very accurate to the sorts of styles common in Hokkaido, his Platinum design is a lot better.
Hilbert is cool. I'd like if his jacket was a bit more plain, but that's just me. In general, his design is just great.
Nate looks great as an overworld sprite and his hair being more of a focus point rather than a hat is a neat outlier, but he just doesn't look good in official artwork. The eyes and wetsuit, which are much less visible in his in-game sprites, are the main issues.
Calem's default design is awful, the sunglasses and boots are a travesty. With customization options he can look pretty good, but that's not really fair.
Sun's default design is solid, especially in artwork, though his awful stance and smiley expressions in regular gameplay really make it hard to like him. If we wanna talk customization, I haven't really seen any good remixes of him yet that aren't just palette swaps of his default outfit.