Pumpkin Pete's

Sadly, the cereal isn't very good for you.

Pumpkin Pete's (possibly 'Pumpkin Pete') is a brand of cereal in the world of RWBY. Currently, the only known flavor is 'Marshmallow Flakes'.

Only characters from cartoons and star athletes are awarded the 'honor' of getting their face on the packaging. Pyrrha Nikos currently has her face on every 'Marshmallow Flakes' box.

The First Step
The cereal is referenced by Weiss Schnee briefly. During a conversation in which Jaune Arc suggests that Weiss and Pyrrha Nikos join 'the winning team' (being his), Weiss becomes annoyed as she was planning to have Pyrrha as a partner. Weiss questions if Jaune even knows who Pyrrah is (which he doesn't) before listing several impressive feats performed by Pyrrha, which Jaune has no knowledge of. As a last attempt at explaining the great accomplishments of Pyrrha Nikos to Jaune, she mentions that Pyrrha is on Pumpkin Pete's cereal boxes. This works as Jaune at long last is obviously impressed by this feat and promptly realizes that he does not have the 'right' to ask her to join his team, as it should be the other way around.

Trivia

 * Pumpkin Pete could be a reference to the nursery rhyme "Peter Peter Pumpkin Eater."
 * Despite the people on the box being star athletes (or cartoon characters), the cereal itself is apparently not very healthy according to Pyrrha. She does, however, admit it was "pretty cool" to be on the box.
 * This is a parody of the real-world cereal box General MillsTM Wheaties for the fact that famous or star athletes and cartoon characters appear on the box of cereal.