Super Smash Bros. Arena

Super Smash Bros. Arena is an upcoming crossover game for Wii and Nintendo 3DS. The game will pubilshed by Nintendo and Disney Interactive Studios. It will feature Nintendo, Disney, Nickelodeon, Benny, Leo and Johnny's Adventures, etc.

Mario

 * Mario
 * Luigi
 * Princess Peach
 * Bowser
 * Wario
 * Yoshi

Donkey Kong

 * Donkey Kong
 * Diddy Kong

Kirby

 * Kirby
 * King Dedede
 * Meta Knight

The Legend of Zelda

 * Link
 * Zelda/Sheik
 * Ganondorf
 * Toon Link
 * Toon Zelda

Earthbound

 * Ness
 * Lucas
 * Paula

SpongeBob SqaurePants

 * SpongeBob SqaurePants
 * Patrick Star
 * Squidward
 * Mr. Krabs
 * Sandy Cheeks
 * Plankton

Invader ZIM

 * Zim
 * Gir
 * Dib

Pokemon

 * Pikachu
 * Jigglypuff
 * Pokemon Trainer

The FT Squad

 * Kyle the Otter
 * Kristen the Otter
 * Kaya the Otter

Benny, Leo and Johnny's Adventures

 * Benny the Beast
 * Leo the Lionheart
 * Johnny the Lion
 * Rae the Lioness

Adventure Time

 * Finn
 * Jake

Sgt. Frog (Keroro Gunso)

 * Keroro
 * Tamama
 * Giroro
 * Kururu
 * Dororo

Fire Emblem

 * Marth
 * Ike

Star Fox

 * Fox McCould
 * Falco
 * Wolf

Annoying Orange

 * Orange
 * Pear
 * Marshmellow
 * Passionfruit
 * Midget Apple
 * Grandpa Lemon
 * Grapefruit

Mickey Mouse universe

 * Mickey Mouse
 * Minnie Mouse
 * Goofy
 * Donald Duck
 * Daisy

PB&J Otter

 * Peanut Otter
 * Baby Butter Otter
 * Jelly Otter

Phineas and Ferb

 * Phineas Flynn
 * Ferb Fletcher
 * Candace Flynn
 * Agent P (Perry the Platypus)
 * Dr. Heinz Doofenshritz

Regular Show

 * Moredicai
 * Rigby

The Amazing World of Gumball

 * Gumball Watterson
 * Darwin Watterson

Others

 * Sackboy
 * Nana and Popo (Ice Climbers)
 * Mr. Game & Watch
 * Pit (Kid Icarus)
 * Steve (Minecraft)
 * Scorpion (Mortal Kombat)

Engilsh Cast

 * Charles Martinet: Mario and Luigi
 * Ikue Ōtani: Pikachu
 * Jeff Manning: Announcer, Master Hand
 * Kazumi Totaka: Yoshi
 * Makiko Ōmoto: Kirby, Ness
 * Nobuyuki Hiyama: Link
 * Rachael Lillis: Jigglypuff
 * Jim Walker: Fox
 * Takashi Nagasako: Donkey Kong
 * Kyle Grove (kylgrv): Kyle the Otter
 * Kristen (wrightgirl11, last name unknown): Kristen the Otter
 * Benny J. Ross: Benny the Beast
 * Vincent Martella: Phineas Flynn
 * Thomas Sangster: Ferb Fletcher
 * Ashley Tisdale: Candace Flynn
 * Dee Bradley Baker: Perry the Platypus (Agent P)
 * Dan Povenmire: Dr. Heinz Doofenshritz
 * Alyson Stoner: Isabella Garcia-Shapiro, Jenny, Jelly Otter (replacing Jenell Brook Slack, because of growing up.)
 * Adam Rose: Peanut Otter
 * Gina Marie Tortorici: Baby Butter Otter

Trivia

 * Jelly Otter will be voiced by Alyson Stoner, since Jelly's original voice actor "Jenell Brook Slack", grew up.