Pi doesn't have a webpage, but there's a blog that regularly updates translations of Pi's jwebs. You need a password to access the site though, since it was locked recently due to flamers. The link is here, you can email the webmistress for the password.
I didn't watch the NEWS Nippon DVD, just saw random clips of it on youtube, NEWS back in those days were a little too young and skinny for me. The only stuff I watched are from around late 2004 to early 2006 period.
I wouldn't say I know alot about Uchi, but here's what I gathered about him from both NEWS and Kanjani8 clips -- Uchi is the youngest member in K8, hence he's often treated like a kid and spoiled by the older members. It's really quite obvious how the rest indulges and dotes on him in K8. However, he's consider the older members of NEWS (even though Massu is older by a few months) and always get to stand in front while folks like Massu & Shige stands behind. I suppose since he's the 'older' member of the group, he behaves different, cause he's usually a major dork with the K8 folks.
I'm sorry but I only watch stuff from youtube... hence no alternative links, I probably can't find the exact clip whereby Ryo slapped Kusano now since I watched it eons ago.