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1 — 7, decent villain, not quite a masterpiece, but close to a 10/10.
2 — 5, a mediocre design, not to my taste.
3 — 6, an acceptable design.
4 — 6, an acceptable design (x2).
5 — 5, a Koshino design, I've seen better artwork of him.
6 — 6, a tolerable design, but the first one is more appealing.
7 — 6, not a terrible design, otherwise the rating would be lower, but the face is a bit blurry.