Cutest: Actually, I think Matsuura aya is the cutest in a very natural way. But since she isen't in morning musume, I'll definetly pick Rika Ishikawa. She isen't as natural as Matsuura, but she's manages quite well. Ai and nono aren't "cute" in that way... The remind me a bit of tatu sometimes.
Sayumi's cute seems VERY forced, and I don't find her "me-me-me" attitude very cute either.
funniest: probably Mari Yaguchi, Although I find Rika quite funny too.
Prettiest: tie between um.. I do think most of the members have strong points, and they look very different. Few of the are downright "ugly", but they all have very characteristic faces.
Personality: They make a good blend. (or used to make )
Singing voice: In general: Ai Takahashi. But I like the style of Yuuko Nakazawa's singing too, laid back, relaxed. For "cute" I think rika, and overly cute the W girls. I think hitomi yoshizawa was really suited for shabondama.
But overall I like Aya Matsuura's voice the most, she can sing quite well, but still do the "cute" songs, she's luckily not in morning musume though.