These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Dork Age: His early WCW "white-meat" babyface run. His reign as Undisputed Champion is something of one too, looking so weak he was barely able to beat midcarders and taking a backseat to Triple H & Stephanie McMahon's bulldog Lucy in the build-up to the WrestleMania main event WWF Championship match.
Ensemble Darkhorse: It helps that Jericho is one of the few wrestlers who can successfully play both an entertaining Hero and Villain. Plus his incredible in ring skills.
Ho Yay: With The Big Show, when they teamed up in 2009. When they were forced to split up after losing the Tag Titles due to being on separate brands, the writers handled the split as if they were a couple separating.
Also during the WWE Draft in the late spring of 2005. Jericho was hosting the first round of the draft on Raw, and John Cena was the first Superstar selected from SmackDown. It's not enough to say that Jericho was thrilled to have Cena on the show; he practically squealed with glee when he heard Cena's music. The perky, tomboyish hairstyle he was sporting that night only made things worse.
Jerkass Dissonance: In his 2012 return to the WWE. By that point the nostalgia had set in, and Chris couldn't get the heat to last until he started to insult Punk's family and cross the MEH. Then when his feud with Punk ended it went back into nostalgia territory, so when Chris returned again in 2013, he wisely did so as a face.
And perhaps his greatest contribution to the English language - "assclown".
"It will never, EEEEVVVERRRR happen again!"
Chris Jericho invented [X].
Moral Event Horizon: Punching Shawn Michaels' wife, former Nitro Girl "Whisper" Rebecca during his 2008 feud with HBK. Not so much the act (which was actually intended to hit Shawn instead) but the fact that afterwards he showed no remorse and actually seemed proud of it.
He crossed it again in his feud with CM Punk, where suddenly, out of nowhere, he brings up Punk's father being an alcoholic - then follows that up next week with saying his sister was a drug addict...plus his insinuation that Punk's sister slept around in order to get the drugs to feed her addiction. He even calls Punk a Heroic Bastard.
And then came the night after WrestleMania. After CM Punk was forced to defend his title against Mark Henry with an injured back which ended in a countout, Chris Jericho went to mock Punk, now writhing in pain. What does Jericho do to a defenseless, straight edge champion? Pour a bottle of Jack Daniels over his head and smash another bottle over his head while propclaiming that he will turn Punk into a drunk.
And in the week after, he's back again, and this time he's pouring cans of beer.
Jericho's plain-vanilla-face early WCW theme, while not Suspiciously Similar Song version of anything, is now frequently used for sports highlights.
Vindicated by History: On paper, Jericho's reign as Undisputed Champion looks a lot better a decade after the fact, as the details of his feuds are forgotten by the younger generations of fans on only the facts that he held the Championship the longest and went over both The Rock and Steve Austin are remembered.