Hammer Bro
Throws hammers. Lots and lots of hammers. The Hammer Bro doesn’t move from side to side, so you’re safe as long as you stay out of range.
Chain Chomp
Jumps at nearby opponents, biting at them fiercely. If a Chain Chomp falls off the stage, it just jumps right back up! If a Chain Chomp’s stake is on a breakable platform, the Chain Chomp falls off the stage if it breaks.
Thwomp
Squishes opponents caught beneath it. Can’t be KO’d.
Waluigi
Stomps on nearby opponents, then launches them with a racket. He only ever jumps directly up, so leaping left or right is a good way to avoid him.
Klaptrap
Leaps up on opponents and bites down with sharp fangs.
Skull Kid
Skull Kid calls on a variety of mystical powers when he appears in the battle. Unfortunately, these powers affect whoever summons him too!
Skull Kid has three different moves: make everyone invisible, flip the stage horizontally, and flip the stage upside down.
Moon
Falls from the sky and causes a massive explosion when it hits the stage. Can’t be KO’d.
Midna
Warps around the stage, grabbing and throwing opponents with a powerful swing. Watch out for Midna’s hand-shaped hair. She reaches out and grabs nearby fighters no matter how badly you wish your shield could stop it.
Ghirahim
Throws knives and slashes with a blade, closing in on opponents by dashing and warping. He also deflects any projectiles he’s facing.
Metroid
Latches on to an opponent and steals their energy. It can be killed if frozen.
Mother Brain
Attack Mother Brain to defeat her! The glass around her shatters after she fires lasers—that’s your chance to strike! Mother Brain fires ring-shaped projectiles called Rinkas from off-screen. These are energy-based, so they can be absorbed or reflected.
Nightmare
When Nightmare changes from his Power Orb to his true form, the screen goes completely black, obscuring the stage. Can’t be KO’d.
Knuckle Joe
Opens with a Vulcan Jab, then unleashes Smash Punch or Rising Break.
Chef Kawasaki
Grabs hold of opponents and mixes them into a pot. Once the broth is ready, he makes health-recovery items!
Andross
Moves into the background, then fires polygon panels at the stage. Can’t be KO’d.
Krystal
Fights with a staff and shoots ice magic at opponents.
Samurai Goroh
Charges around the stage, swinging a dangerous katana.
Starman
He shoots either a PK Beam 
or PK Beam 
, stunning fighters. PK Beam 
targets one fighter, but 
is less discerning. If you can keep up with his teleporting, Starman can be defeated. Reflecting or absorbing the PK Beams is a good strategy too.
Jeff
Fires a volley of five bottle rockets. Jeff’s bottle rockets explode when they hit obstacles, so hiding in a place with walls or ceilings helps to protect you from them. Can’t be KO’d.
Tiki
Transforms into a dragon and breathes fire.
Lyn
Lyn is a swordfighter who has perfected her Quick Draw. After she draws her sword, she attacks the nearest opponent. Right before she strikes, Lyn moves slightly this is your cue to dodge and avoid her attack!
Black Knight
Slowly approaches, then executes several extremely powerful slashing attacks. He can only be launched by very powerful attacks.
Phosphora
Moves around at lightning speed, shooting three types of electric attacks.
Ashley
A dark field appears around Ashley. Any foes inside the field move more slowly and take continuous damage. Can’t be KO’d. Unless you’ve summoned Ashley, eating food while within her dark field causes damage instead of healing. It’s Pit’s worst nightmare!
Burrowing Snagret
Pecks at opponents with its beak.
Kapp’n
Takes opponents who are hit by the bus off the screen. Even if you’re forced to board the bus, you can wiggle the control stick to get out. However, Kapp’n reappears multiple times. Can’t be KO’d.
Riki
This fluffy little Nopon has six Arts he might use, picked at random, each with a different effect. Sadly, he might end up helping your opponents… Can’t be KO’d.
Color TV-Game 15
Starts a rally with two paddles and reflects any projectiles that hit them.
Sheriff
Sheriff fires high-speed, powerful shots at fighters. It’s impossible to reflect or absorb these shots!
Devil
The Devil begins pointing in various directions, and the stage shifts that way. If you slide off the screen, you’re KO’d! The Devil can’t be KO’d.
Takamaru
Gets up close to opponents and unleashes a flurry of slashes. The Windmill Swords travel in a cross shape.
Dr. Wright
Calls a building up from the ground. If he’s struck, he counterattacks with a huge building!
Flies & Hand
Appears and tries to swat several annoying flies.
Prince of Sablé
Transforms into a frog or a snake, then hits opponents with a flurry of attacks. Can be KO’d while in his prince form.
Sukapon
Spins around and tackles opponents, occasionally chucking its own head.
Isaac
Uses hands, created with Psynergy, to carry opponents away.
Starfy
Performs a Star Spin at nearby opponents. However, the attack is weak.
Nintendog
Jumps up onto the screen, blocking the view. But it’s too cute to be mad at. Can’t be KO’d.
Dr. Kawashima
Numbers fly in from off the screen. Attack them to make them change direction. Causes huge explosions if two numbers collide and add up to 10. Can’t be KO’d.
Vince
Covers up opponents with drawings and deals damage.
Dillon
Rolls around wildly with Roll Attack. His Arma-Charge is super powerful, so get to dodging if you see him spinning up!
Yuri Kozukata
Stuns opponents caught in the photo. Can’t be KO’d.
Arcade Bunny
Grabs opponents with a crane. Can’t be KO’d.
Spring Man
Uses his extending arms to reach opponents, and uses a Rush in a pinch.
Squid Sisters
They perform and become the focus of the camera, shrinking the screen. Can’t be KO’d.
Ghosts
Blinky, Inky, Pinky, and Clyde all appear on the stage! They each have their own movement patterns and hurt opponents who touch them. Defeating one sends the rest fleeing.
Bomberman
Places bombs that cause chain explosions, and also places remotely detonated bombs. You can move the bombs by attacking them. But if you get too close to a remote bomb, Bomberman can detonate it.
Alucard
Slashes at nearby opponents, and can travel around the stage as mist or a bat.
Wily Capsule
Warps around the stage, shooting three different kinds of shots.
Zero (Mega Man)
Slashes with the Z-Saber, and when it’s time for Zero to depart, he unleashes Genmu Zero.
Knuckles
Dishes out uppercuts and spin attacks to opponents.
Shadow
Uses Chaos Control to slow down opponents. Can’t be KO’d.
Guile
Uses Flash Kick on nearby opponents.
Akira
Performs powerful physical attacks using Bajiquan.
Gray Fox
Uses a high-frequency blade to cut down opponents and reflect projectiles.
Rathalos
Swings its tail and poisonous claws around, attacking any nearby opponents. You can damage Rathalos’s tail! Succeed and an item appears.
Rodin
Summons a massive punch into the battle. He sometimes leaves a weapon behind when he departs.
Shovel Knight
Attacks enemies with a shovel, and also digs hidden holes that trap enemies. While Shovel Knight is digging holes, he sometimes digs up food! He can also reflect projectiles with his shovel.