The 4.0 patch dropped between recording sessions, which added percents to the custom stage testing screen. That's why you don't see percents for some characters and do for others.
I think I got everyone whose recovery was buffed in 4.0.
Music:
City Trial (Kirby Air Ride) [Ultimate]
The Legendary Air Ride Machine (Kirby Air Ride) [Brawl]
The Great Cave Offensive (Kirby Super Star) [WiiU/3DS]
C.R.O.W.N.E.D (Kirby's Return to Dream Land) [Ultimate]