Jerkass Fašade: He's harsh with the contestants, but it's because he sincerely wants to push them to do their best work.
Self-Made Man: Bobby came from a hard-scrabble existence in a rough neighborhood of the Bronx, dropped out of high school, and fell in with a bad crowd, by his own admission. But then he got a job at a restaurant and realized he loved it. He finally had a long-term goal, and he began working hard to become the best chef and entrepreneur he could be. He built himself up into the celebrity chef he is today through Horatio Alger-style hard work. Quite admirable.
But Now I Must Go: In Season 6 she's brought aboard as a mentor to the contestants during the Los Angeles portion of the season; when the contestants go to New York for the final leg of the journey, Giada wishes them good luck and encourages them to remember everything they've learned.
Formerly Fat: Alton describes himself this way and it becomes important in Season 8 when he goes to bat for the also-Formerly Fat Judson and expresses how a lot of people could relate to Judson's story.
Running Gag: The constant question of whether or not he uses lipstick. He has stated that he doesn't, and that his lip color is from the frequent use of Burt's Beesnote This was said outside of the series.
Cool Old Lady: She seems to think of herself as this, but she is not all that old.
Cordon Bleugh Chef: Her food never looks all too appealing, but it doesn't seem to taste too horrible. She also has had a number of dishes that weren't well liked.
Expy: She is basically a cross between Paula Dean and the Pioneer Woman — who cannot cook all too well.
Motor Mouth: She just talks, and talks, and talks, to the detriment of her team.
Not Quite Saved Enough: The judges decide to let her make a pilot rather than eliminate her in the penultimate episode, only for her to be the lowest scoring contestant in the national poll. Also a notable subversion of Creator's Pet, since despite her being put through she still didn't win. invoked
Lethal Chef: The mini-arc in episode four concerning the rise and fall of her "doughnuts" made from store bought pizza dough which she's rolled into super-dense wads and deep fried before dunking in cinnamon and sugar certainly made her seem this way. Nobody thought this was a good idea except for her. And she looked completely baffled and shattered when told by the judges that everyone found them inedible.
Sassy Black Woman: While she's generally very nice, she can shift into this when necessary.