Rhythm Monkey

Rhythm Monkey goes for a Perfect!

The Mii
Use the Monkey Hat and Outfit and Type 8 Low for the voice.

The Moves
For neutral special, Rhythm Monkey goes back to its penguin-helping roots and throws a small amount of bait at the opponent. (Shuriken of Light) For side special, they charge up and wait for the opponent to approach before attacking, calling back to the fighting style of a certain samurai... (Gale Stab) Up special references one of the moves they do in Tap Trial, namely the jump. (Stone Scabbard) And finally, Reversal Slash requires you to time it, almost like a Rhythm Heaven minigame!

The Style
Animal Acrobat demonstrates that monkeys in the Rhythm Heaven universe can be quite agile, so use Lightweight Style.

The Spirits
Undamaged Attack ↑ means that this tiny primate packs quite a punch... as long as you don't break its Perfect. Luckily, First-Strike Advantage grants it the Skill Star buff when it lands the first hit of the match, giving it full invincibility for 5 seconds.

Analysis
I took a similar approach to Professor Layton, aiming to replicate the feeling of Rhythm Heaven instead of the gameplay. As long as they use Neutral Special and their long stick to keep their opponent away, they can dish out insane damage, however the true trick to getting Perfects is to go in confident, much like the Skill Star buff.

Unlock Battle
To unlock Rhythm Monkey, you'll have to team up with Tap Girl (Peach with her red costume) to defeat two of them with their favorite song playing in the background.

If a rule setting isn't listed, it is the default setting: Stage: Omega Pictochat Music: Monkey Watch Style: Stock Stock: 1 Time Limit: Infinite FS Meter: Off Spirits: On CPU Lv.: 8 Items: None

Summary
The Ray MK II with Lightweight Style: 1 Support Spirit with Undamaged Attack ↑ 1 Support Spirit with First-Strike Advantage