Just thought i'd put together a topic so that those looking to unlock the characters they want can do so with a bit of ease. Some of this is taken from other sites including gamefaqs. There are other ways of unlocking some of these karts, characters and bikes, once gotten confirmation from multiple sources will add them to the list. The Rosalina one, isn't 100%, i went and made a Galaxy save, but this was after i had completed all the games cups, when i went back into the game, she was there. So she is linked to the Galaxy save file, just not 100% sure if you unlock her through 50cc. I have yet to get 1 star on 150cc All retro Grand Prix Cups (2 cups to go) and don't have 1 star on all cups for mirror grand or retro. Chances are, some of those, not sure which, unlock the missing two karts. Or, it's possible, getting 32 expert time trial ghosts unlocked might do something as well. Starting Characters Baby Mario Baby Peach Toad Koopa Mario Luigi Yoshi Peach Wario Waluigi Donkey Kong Bowser Unlockable Characters: King Boo - Win 50cc Star Cup Diddy Kong - Win all 50cc Cups Baby Daisy - Attain at least 1 Star Rank for all 50cc Wii Grand Prix Cups Mii (Outfit A) - Win 100cc Special Cup Mii (Outfit B) - Unlock 32 Expert Staff Ghost Data in Time Trials Dry Bones - Win 100cc Leaf Cup Bowser Jr. - Attain at least 1 Star Rank for all 100cc Retro Grand Prix Cups Daisy - Win 150cc Special Cup Dry Bowser - Attain at least 1 Star Rank for all 150cc Wii Grand Prix Cups Funky Kong - Unlock 4 Expert Staff Ghost Data in Time Trials Baby Luigi - Unlock 8 Expert Staff Ghost Data in Time Trials Birdo - Play Time Trials on 16 different courses/Get 250 wins online Toadette - Play Time Trials on all 32 different courses Rosalina - With a Super Mario Galaxy save, win a series of Grand Prix cups/Without Galaxy save, Attain at least 1 Star Rank for all Mirror Grand Prix Cups Unlockable Karts: Cheep Charger (small kart) - Attain at least 1 Star Rank for all 50cc Retro Grand Prix Cups Blue Falcon (small kart) - Win Mirror Lightning Cup Rally Romper (small kart) - Unlock 1 Expert Staff Ghost Data in Time Trials Turbo Blooper (medium kart) - Win 50cc Leaf Cup Royal Racer (medium kart) - Win 150cc Leaf Cup B-dasher mk2 - Unlock 24 Expert Staff Ghost Data in Time Trials Piranha Prowler (large kart) - Win 50cc Special Cup Dragonetti (large kart) - Win 150cc Lightning Cup Aero Glider (large kart) - Attain at least 1 Star Rank for all Retro Grand Prix Cups Unlockable Bikes: Quacker (small bike) - Win 150cc Star Cup Bubble Bike (small bike) - Win Mirror Leaf Cup Magikruiser (small bike) - Play Time Trials on 8 different courses Rapide (medium bike) - Win 100cc Lightning Cup Nitrocycle (medium bike) - Attain at least 1 Star Rank for all 100cc Wii Grand Prix Cups Dolphin Dasher (medium bike) - Win Mirror Star Cup Twinkle Star (large bike) - Win 100cc Star Cup Phantom (large bike) - Win Mirror Special Cup Torpedo (large bike) - Unlock 12 Expert Staff Ghost Data in Time Trials Misc Unlockables: Picture option to send to Wii Message Board - Complete all 8 Cups in a class Karts & Bikes (50cc) - Earn trophies in all 50cc Grand Prix Cups Karts & Bikes (100cc) - Earn trophies in all 100cc Grand Prix Cups Mirror Class - Win all 150cc Cups Alternate Title Screen - Win all Cups I recommend anyone new to the game, go into time trials, and unlock Funky, Baby Luigi and Birdo early on, the regular Nintendo Ghosts are easy to beat, the expert ghosts you unlock, are pretty nuts though.