Super Smash Bros. (series)

Super Smash Brothers (commonly abbreviated as Super Smash Bros. or SSB) is a series of games developed and published by Nintendo. The series, consisting of five games so far, are fighting games that feature many of Nintendo's game's famous characters as fighters. Despite being a Nintendo series, the Rhythm Heaven Series has made minor appearances in the games.

Super Smash Bros. for Nintendo 3DS/for Wii U
Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U are the fourth and fifth installments in the franchise. While the Rhythm Heaven Series existed before the third game, this is the first game in the series tho include it in some form.

Smash Run Enemy
In for Nintendo 3DS's Smash Run mode, the player runs through a course while fighting off many enemies from various Nintendo franchises. Among these enemies is the Sneaky Spirit.

Sneaky Spirits are rare enemies. The move just like they did in the original game, by popping up and down in the ground, moving to the right slowly, then jumping to the left to do it again. The popping can damage a player. Since they hide often and move quickly, hitting them can be difficult. However, they are weak otherwise, and managing to hit them enough sends them flying off, dropping a rare star boost, which ups all the stats of the player's character.

Trophies
In both games, there are collectible trophies that depict various characters, places, and other things from Nintendo franchises, complete with short descriptions. Among these trophies are Rhythm Heaven ones, classified as "Other".

In total, there are five trophies in the game from the Rhythm Heaven series. Three are exclusive to the 3DS version, as they are from the portable games. On the Wii U version, two trophies from the series can be obtained, both being from the home console installment.

The Chorus Kids
Game: 3DS Description:

🇺🇸 There are few games with as many charming characters as the Rhythm Heaven series. Take those groovy Love Lizards, for example. Birds could learn a thing or two from them. And what about the Chorus Kids? They look adorable with their little bow ties, but things get odd when they open their mouths...

When it comes to the weird and wonderful, the Rhythm Paradise series has got all other games beat. Take those groovy Love Lizards, for example. Birds could learn a thing or two from them. And what about the Chorus Kids? They look adorable with their little bow ties, but things get a bit freakish when they open their mouths...

Karate Joe
Game: 3DS Description:

🇺🇸 Has there ever been a cry more manly than the "Uh!" that appears at the start of every Karate Joe stage? It's like he digs deep down inside himself, reveals his spirit with that "Uh!" of power...and then directs that energy into smashing flowerpots, bulbs, and exploding barrels. Karate Joe knows no fear!

Has there ever been a cry more manly than the "Uh!" that appears at the start of every Karate Man stage? Doesn't it sound like it comes from the very bottom of his soul? Or is that just us? ...Anyway! Karate Joe is a pretty cool guy. He punches flowerpots, bulbs, even exploding barrels without the slightest hesitation. Truly, he fears nothing.

Sneaky Spirits
Game: 3DS Description:

🇺🇸 Skinny white ghosts that travel with a smirk on their face. They move like they do in Rhythm Heaven, popping up and down in rhythm before trying to run away. If you manage to defeat one, you'll earn a star-shaped stat boost that improves all of your stats. Time your attacks and keep them from escaping.

These white apparitions seem to have permanent smirks on their faces. Much like in the Rhythm Paradise series, they'll pop up rhythmically from a hiding place beneath the floor, then run away to a distant location. If you do manage to defeat one, you'll get a reward for your troubles, So pay attention to the rhythm and strike!

Marshal, Cam, and Miss Ribbon
Game: Wii U Description:

🇺🇸 From the right: Cam, Marshal, and Miss Ribbon. Cam is quiet and looks like a thinker, but his mind is actually a blank slate. Marshal looks cute and can be relied upon. Miss Ribbon looks innocent but is really quite stubborn. Some think these guys are related to the Chorus Kids from the previous Rhythm Heaven.

The white one is Matt, the blue one's Cam, and the pink one's Miss Ribbon. Matt looks like a dreamer, but he's pretty down-to-earth. Cam always seems to be deep in thought, but he's really just spacing out. And Miss Ribbon seems innocent and sweet, but is actually pretty stubborn. Are these guys related to the Chorus Kids?

Wrestler and Reporter
Game: Wii U Description:

🇺🇸 Live from the Rhythm Arena! When the reporter asks, "Wubbadubbadubba, 'zat true?" the wrestler will answer on the beat. When the reporter is amazed and says, "Whoa, you go, big guy!" the wrestler will flex and pose. Finally, when the other reporters request the wrestler to "pose for the fans!" he will do just that. Wubbadubbadubba, that's cool!

Live from the Rhythm Arena, we bring you a true wrestling phenomenon! Swoon as he displays his outstanding physique! Marvel at his enlightening responses whenever he hears "Wubbadubbadubba, 'zat true?" And when he poses for the fans, we won't blame you if you faint. Whoa, you go, big guy!

Music
The Super Smash Bros. series also plays music throughout various stages, wether it be a remixed soundtrack or ripped straight from the games themselves. Starting with Brawl, players can choose different music to their own liking. In the Miiverse stage, two songs from the Rhythm Heaven series can be played in the stage. Those being Blue Birds from Rhythm Heaven and Monkey Watch from Rhythm Heaven Fever, respectively.

Spirits
Several Rhythm Heaven characters appear as Spirits in Super Smash Bros. Ultimate. The Rhythm Heaven series holds the distinction for having the most Spirits out of any non-fighter-represented series.

Music
The music from Blue Birds, Monkey Watch, & Fruit Basket can be bought in the shop and play on any non-fighter-represented stage.

Trivia

 * Karate Joe's trophy description seems to be a reference to the "pretty cool guy" internet meme.
 * Incidentally, there happens to be an icon data for a Rhythm Heaven character in SSB4 titled Rhythm, but it was never used in the final game.
 * Strangely, this icon can only be found in the code of the Wii U version and not the 3DS version.