Hello Tech Man 753 here. I'm going to have all the imformation of Mario And Sonic At The London 2012 Olympic games in this topic. And if any more imformation comes avalible I will update it so here are all the characters:
All Around
Mario
Luigi
Bowser Jr
Amy
Blaze
Speed Type
Daisy
Yoshi
Sonic
Shadow
Metal Sonic
Power Type
Bowser
Wario
Donkey Kong
Knuckles
Vector
Skill Type
Peach
Waluigi
Tails
Eggman
Sliver
Non-Playble
Rivals
Eggman Nega
Dry Bowser
Jet The Hawk
Refrees
Toad
Cream
Lakitu
Shy Guy
Charmy
Espio
Other
Horse
Big Bullet Bill
Magikoopa
Mega Cheep-Cheep
Koopa Troopa
Shy Guy
Goomba
Yoshis
Chain Chomp
Monty Moles
Cows
Birdos
Egg Pawn
Sports
Wii
Football
Equestrian
Athletics
100m Sprint
Javelin Throw
Aquatics
Table Tennis
Badminton
Dream Events
Dream Long Jump[
Dream Discus[
Dream Equestrian
Canoeing
Beach Volleyball
Rhythmic Gymnastics
Showjumping
Pistol-Shooting
Uneven Bars
Dream Hurdles
Dream Equestrian
London Party Mode
3DS
20km Race Walk
1000m Kayak
Judo
100m Breaststroke (Aquatics)
Balance Beam
110m Hurdles
Badminton
BMX
Double Trap Pistol Shooting
Story Mode
Dream Events Locations
Yoshi's Island
Battlerock Galaxy
Moo Moo Meadows
Wind Valley
Grand Metropolis
And here are some pics: