Always Second Best: Something of an Unfortunate Truth in Television. Jeff ultimately ended up being the Most Over Hardy in the long run, getting main even pushes while Matt wallowed in the mid/lower card. Even with Jeff's demons concerning drugs, both TNA and WWE saw more stock in him than Matt. Several of Matt's feuds with Jeff involved this trope, making one wonder if Matt actually does have a chip on his shoulder.
Not as much in recent years. He wished Edge well after his retirement, stating that they have both started and ended as friends.
A better example would be Matt's brother, Jeff. When they aren't tagging together nor on different shows, they've more often than not been feuding with each other. Note that in almost all their feuds, Matt's has been the heel with an obvious case of Green-Eyed Monster.
The Artifact: Even though Matt no longer uses the "Version 1" gimmick, he and his fans still flash the "V1" hand signal as shown.
Ascended Extra: Matt and Jeff spent years as TV jobbers for WWE, and they were used to open the doors for the wrestlers at King of the Ring 95.
Attention Whore: The entire thing of what seemed to be his life spiraling down and him planning to commit suicide. After tons of cryptic messages that gave the outright impression he was going to commit suicide. End result of it was him doing a work and just doing it to "test his fans" and advertise his "rebirth".
The fake suicide note caused a genuine panic, with many people actually calling the area police department and getting them to check on him. There was a massive backlash when it was revealed to be fake. In addition to angering fans, this stunt also upset his friends and his sister-in-law.
Berserk Button: Don't you dare give him purple grapes; MATTHEW only eats green grapes.
Blatant Lies: In his TNA debut, claimed not to be like his brother (who was in the midst of his heel run as Immortal's Dark Messiah World Champion), before smacking RVD in the face.
Breakup Breakout: At first, Matt was the Michaels during his Matt Hardy V1 gimmick, during Jeff's first run in TNA. Then the whole Matt/Lita/Edge love-triangle happened, Jeff re-signed with the WWE and became world champion, and Matt became the Jannety whilst still remaining successful. However, after Jeff left the WWE, Matt squandered in the lower card before they both wound up in TNA, where Jeff became the centerpiece of Immortal whilst Matt became a background player in the same stable.
At least until Jeff's drug problems got to the point where TNA decided he couldn't work and sent him home. Now Matt's suddenly become one of the main wrestlers of the group...
...until Matt got put on suspension for chronic lateness and then fired after a DWI, while Jeff was given a second chance and redeemed himself.
Cloudcuckoolander: He has two YouTube channels, one for "Matt Hardy", in which he acts weird, but is a typical vlog-style channel, and one for "MATTHEW" ("ALL CAPS!") where he speaks vague pseudo-philosophy, burns money, shows off his weapon collection, drinks beer, and eats grapes. Lots of grapes.
Incoming Ham: As Version 1 - It started with a web search for Matt Hardy, which then "loaded" the titantron before Matt made his way to the ring, with the screen formated to resemble the then-current look of Windows Media Player, whilst "Matt Facts" appeared on the left of the screen (Usually, these were useless bits of trivia). The "OHHH YEAH!" which started off his theme music qualifies as well.
Claimed on Twitter that it was because of him that TNA saw an increase in their ratings following his debut in the company. Apparently, he thinks he's a bigger draw than Kurt Angle, who returned at the same time Matt made his debut.
Spell My URL With a The: Originally named his official site http://www.thematthardy.com, later changed to http://www.thematthardyshow.com, leading to otherwrestlers taking the same approach for their sites.
Worked Shoot/Real Life Writes the Plot: The whole Lita/Edge affair. Long story short, Lita and Edge were having an affair and Matt was fired after talking about it. Eventually he was re-hired, and the whole scandal was made into a storyline, albeit they made it look like a shoot.
The "MATTHEW" videos were a work to get himself fired from WWE, as he had wanted a release for a while, but some people took them seriously including Spoony.