In an awesome match in May, I believe, he beat Triple H in an amazing WWF championship match, but only kept the belt a few minutes before Triple H strongarmed the referee into reversing the decision, but in my eyes, he still was the WWF Champion that night regardless of how it was erased from the record books.
Jericho, or Y2J, also has one of the best entrace moves of all the superstars. Most just walk out, some stop first and try to look mean, but Jericho has an incredibly loud explosion to announce his entrance and as the smoke clears, you see him standing with his arms out and back to you looking like a volcano about to erupt. Then he spins around and shouts something to either side of him and usually picks up his microphone and begins to talk trash to his opponent with whatever clever insult that comes to mind.
Jericho with his shirt off, looking very muscular
Jericho with his mike, trash-talking his opponent
Jericho in a rage, having referees pull him off of someone
The WWF's bio picture of Chris Jericho
Highly recommended site!
Top picture comes from this site!
All other pictures and height/weight info from http://www.wwf.com