Granted, it's possible you won't find all (or any) of the guys in the videos "pretty." (The second one from the left in the photo below looks a bit lesbian-ish to me, for instance. Not that there's anything wrong with that!)
Regardless, I believe these "boys" are Japanese celebrities, but I couldn't tell you their names or why they're famous.
If you'd rather watch a video that, you know, actually shows (some) of what Nintendo's upcoming portable system is capable of, watch the video at the bottom of the same web page.
