Rumble

Rumble is a Pegasus colt who first appears in the season two episode Hurricane Fluttershy. He has a bluish gray coat, a two-tone dark gray mane and tail, and purple eyes. He is Thunderlane's younger brother.

Design
Rumble bears a slight resemblance to "Shady Daze".

Season two
Rumble first appears in Hurricane Fluttershy alongside his brother Thunderlane when Twilight Sparkle tests her anemometer and Spike gives a simplified explanation of what an anemometer is. When Rainbow Dash tells Thunderlane to be the first test flyer and he measures a wingpower of 9.3, Rumble gives him a look of impressed approval. Rumble appears once more before the first tornado formation attempt, informing Rainbow Dash that Thunderlane is sick with the feather flu.

Season four
In Flight to the Finish, Rumble appears beside Featherweight in the stage area where the Cutie Mark Crusaders practice their Equestria Games flag-carrying routine for Rainbow Dash. In Twilight Time, Rumble appears mostly off-screen during the grand opening of Pipsqueak's lemonade stand. In Inspiration Manifestation, Rumble appears with his brother Thunderlane at the Foal and Filly Fair.

Merchandise
Rumble appears on the Season 2 poster.

In series 2 of Enterplay's trading cards, Flitter and Cloudchaser's card, #17, states that they are Rumble's foalsitters.

In the Canterlot Nights expansion set of Enterplay's collectible card game, card #20 C lists Rumble's name with a trademark symbol and gives him the description "Rumble's big brother Thunderlane is one of the best fliers in Ponyville, so Rumble practices every night trying to catch up."

Quotes
"He's got the feather flu. He's down at Ponyville Hospital."

- Hurricane Fluttershy