Mordecai and Rigby

How Mordecai and Rigby joined the Tourney
Mordecai is one of the main protagonists of Regular Show, along with his best friend Rigby. Mordecai is a 23-year old blue jay. He made his debut in a non-canon short ("2 in the AM PM") as a human cashier, who then morphs into a prototype Mordecai-like character with a fanny pack. He later makes his first official appearance in the Pilot episode. Mordecai is voiced by the show's creator, J.G. Quintel.

Rigby is one of the main protagonists of Regular Show. Rigby is a 23 year-old raccoon. He made his debut in the original Pilot episode working as a groundskeeper at the park. He is voiced by William Salyers.

When the 2nd Tourney was announced by an unknown girl, Mordecai and Rigby stopped working and decided to enter the tourney and win the thropy, but they got run over their boss Benson, who's really mad at them.

Punchies/Step Off (Neutral)
Mordecai attacks the opponent's shoulder with his fist.

Rigby chops the opponent while saying "STEP OFF!!". This can be charged up.

Golf Cart (Side)
Both Mordecai and Rigby rides on a golf cart, attacking the opponent in a process, very similar to Wario's Side Special.

Trampoline
Both Mordecai and Rigby jumps on a trampoline, great for recoveries.

Switch (Down)
Mordecai/Rigby switches to Rigby/Mordecai.

The Bicycle Kick Of Death/Death Punch of Death (Hyper Smash)
Mordecai goes upside down, then does a straight forward kick that does a high knockback.

Rigby runs like a mad man, then does a powerful punch that does a high knockback.

Eagle Man (Final Smash)
A bunch of Baby Ducks comes, transforms into Eagle Man, before the begining the attack, he says "STEP OFF!!" and does a flaming karate chop, after that they returned into their normal form.

Trivia

 * Mordecai and Rigby where both cofirmed to be the first Regular Show characters, along with Benson and Skips.
 * Panty and Stocking, the sexy angels are Mordecai and Rigby's rivals.