I'm pretty sure you have to beat either 100cc's special cup or 150cc's special cup in first place. If i'm wrong try beating lightning cup on 150cc.
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If you need to unlock her in Mario kart wii here is the answer: Win the 150cc Special Cup. If you need to unlock her in Mario Kart 7 here is the answer: Win the 150cc Mushroom Cup. Source: I beat Mario Kart Wii, and I unlock Daisy in Mario Kart 7.
Wiggler is not unlockable in Mario Kart Wii.
On Mario Kart Wii unlock all the cups and do all the time trials. You'll get Toadette. And Mario Kart DS? I have no idea why this is, but you can't get her! Good luck!
There is no 300cc cup on Mario Kart Wii.
To Unlock Mii in Mario Kart you have to come 1st in the 100cc Special Cup. Or to Unlock the Other Outfit for the Mii you can unlock all 32 Expert Staff Ghosts.