Mind Screw: He gives himself a headache trying to figure out how the switching cutie marks of the mane six also changes where they live, as well as apparently their past and how characters react to them.
Basement-Dweller: Implied and played for laughs in the season 3 finale. After deciding that having wings and a horn makes you a princess, he realizes that he is wearing (fake) wings and a (fake) horn, so he turns and yells "MOM! I'M A PRINCESS!" His mother responds by saying he's an embarrassment.
The Quiet One: In the Season 2 finale reaction episode; he doesn't actually say anything, but voices over himself in two different moments (when Twilight exposing Cadence goes wrong, and during This Day Aria, using his cover). Justified in that he was recording in a house instead of a car, and his No Indoor Voice would've bothered everyone inside.
Large Ham: Not as much as Solrac, but he still qualifies.
Running Gag: Flipping his table at the end of episodes if there was no Octavia.
Less memorable is his habit of pointing at the screen when he sees Luna, throwing his arm forward so fast to do so that he sends a container flying off his table, complete with the sound of something breaking.
Bad Liar: In Smile HD, when trying to hide the true nature of the video from Monique Creber, he claims the blood is "ketchup" and that the video is actually an episode of the show that focuses around the healthiness of eating tomatoes.
Later, when Michelle Creber comes in, he (with some help from Monique) tries to hide it from her differently, by saying they were actually just watching the show intro. Hilariously, while Monique doesn't seem to believe Gryphon (or, if she does, is definitely very suspicious), Michelle seems to buy it, leading to her being confused whenever Gryphon says the video was disturbing.
Limited Wardrobe: Somewhat; so far, with the exception of being a ninja, he's always worn a military uniform in his appearances. However, the actual uniform changes.
Zig-zagged in Smile HD. He starts off in costume as Apple Bloom due to it being another Halloween special, but later when Michelle Creber walks in, he quickly ditches the costume and tries to cover up with his typical military jacket. But by the next scene, he's given up and is back to being in costume again.