Catch Phrase/Fan Works

Examples of Catch Phrases in Fan Works include:

Luminosity‍'‍s Chelsea rarely says...anything, actually, but thinks "Everyone must love me" constantly.
Make a Wish provides us with Mr. Black's "I'm just a guy on vacation."
Shadow Crystal Mage's Takamachi Nanoha of 2814 has "Mine!" Everyone says it at some point.
In Light and Dark - The Adventures of Dark Yagami, characters often declare that they will do something, "OR MY NAME ISN'T (full name)". Amusingly subverted when Sayu says ?I WILL HAVE TO FIGHT (Dark) OR MY NAME ISNT SAYU YAGAMI WHICH ITS NOT ANYMORE BECAUSE NOW ITS sA~y?U ANIME AFTER I MARRED MISA IN MASACHEWSETS.?
BABIES.
- "Heeeeeee~eey... what'cha doin'?"^[1]
In Divine Blood Naiki is the Demoness of Torrent, she often reminds people of this by stating the definition of Torrent: "A violent, tumultuous, overwhelming flow." What follows is usually either incredibly stupid or a Crowning Moment of Awesome.
The Genre Savvy viewpoint character of Isekai by Moonlight worries early in the first chapter that "Stupid genre conventions" is becoming his Catch Phrase. By the end of the second chapter, it has.