Apart from Arsenal players, David Batty is one of the nicest blokes you could ever meet. I got photos with quite a few Arsenal players in 2002 outside Highbury and David Batty(who was being entirely ignored by the crowd and was just having a laugh with Seaman IIRC) volunteered to take the photos for about 5 minutes.
David O'Leary was a nice chap as well, think he was actually apologising to Arsenal fans for having managed the team that beat them.
Robbie Keane was a complete prick.