Bowser Jr.
Entrance: Airship Drop-off. A airship appears and drops him off to the battlefield.
Brown goop will make the opponent have a higher chance of slipping (A.K.A. tripping) and the percentage rate slowly goes higher.
Victory Poses- #1: He poses, saying "You can't beat me!" then laughs.
#2: Has his bandanna and paints the M insignia on the floor, laughing.
#3: Bowser Jr. jumps in glee, saying "Alright! Yeah!" then stands and forms a pose like this:
Loser Pose: Bowser Jr. has a unique one... Kinda. He stomps on the ground in frustration... He really isn't the type to clap for someone other than his Dad.
Shadow Mario
Victory Pose: #1: Sticks out his long tongue and taunts.
#2: Instead of painting on the floor, he paints the M insignia on the screen, laughing behind it. It still shows the clapping people.
#3: Uses is Up-b on the ground, stops, and goes in a pose like this.
Having this Eater Egg accomplished, you'll get his Entrance.
Entrance: Puddle Formation. A puddle of brown goop is on the ground. The brown goop turns blue and forms into Shadow Mario.
Entrance Alternate #1: A transport M appears and Shadow Mario appears from it. The M disappears soon after.
Entrance Alternate #2: Bowser Junior's entrance, only as soon as he lands he's transformed into Shadow Mario.