Youngblood's Disease: The curious disease that plagues superheroes where their musculature becomes implausibly disproportionate and their eyes dissolve into featureless white voids, or even vanish entirely.
Sometimes, when either a character plans something poorly or the relevant military makes a very stupid decision, he has Patton say "...you Magnificent Bastard, I read your book!"
Usually preceded by staring angrily into the camera.
Issues of the Image series Objective Five appears constantly in the Title Sequence as well as several 'comic pile' scenes throughout the series, yet Linkara did not get to review an issue yet.
Batman's hatred of rock music per Batman: Fortunate Son. "Punk is nothing but DEATH and CRIME and the RAGE of a BEAST!" It's also how Linkara points that All-Star Batman/Crazy Steve can't possibly be the real Batman, because he namedrops Jethro Tull's Aqualung.
Also Batman acting like a delusional paranoid nutjob convinced he's terrifying and mysterious despite multiple holes in his logic.
Bonus points with the fact that said clip from the show was an actual Take That to The Clone Saga.
Grape jelly and mustard. That showed up in his first "Linkara Riffs" episode and has become a running gag in both "Linkara Riffs" and his main show.
Describing something he likes/dislikes about a particular setting, character, company, etc. followed with a quick clip of a comic that shows a subversion of his description. Linkara responds to this with an adamant "That doesn't count!"
Sci-Spy protagonist Sebastian Starchild earns a Sean Connery-like Scottish accent to mock his James Bond-wannabe nature.
Though a one-shot comic, he also did this gag with James Bond Jr.. Which is pretty funny, considering the main character is around 12 years old.
"Stay classy Marvel." or a variation thereof, whenever a Marvel Comic contains excessive fanservice.