I saw Yuri as an extremely emotional girl. She is really fragile and anything could set her into 'crying' mode. In fact, as compared to the other 2 firecrackers in the group (if you don't get what I mean, they are Kumi and Kasumi), Yuri would be the weakest link. Indeed, I was dying to strangle her when she threatened to start off another crying session. However, I soon realised if you were forced to do things you cannot cope with, you'll definetely shrink away from the challenge. As for Yuri, crying is her way of expressing her sadness or (perhaps?) anger, so I accepted her crying as a normal part of her. She works her magic silently throughout the 4 anime episodes that keeps Kumi, Kasumi, Miyu and her together. Notice how Kumi got used to Yuri's whinings and even developed some feelings for her *gasp*. I even began to pity her, seeing how much go-catch-that-alien assignments she was forced to do.
That was a very thoughtful post
I feel the same way, too