Sonic: New shoes
Tails: a repair kit for his plane
Knuckles: Anti-Bat protection
Rouge: A diamond worth a lot of money
Amy: Sonic, Duh
Cream: A friend for Cheese
Vector, Espio and Charmy: Money
Shadow: A gun
Sonic: Chili dogs, to go faster!
Tails: Lockheed SR-71 Blackbird
Knuckles: A robo-dummy made to look like him to guard the the master emerald while hes gone.
Cream: Happiness and world peace!
Shadow: DEATH TO ALL WHO OPPOSE HIM!
Rouge: anything and everything.
Elise: To end the Elise hater clubs.
Sonic again: To forget Elise's kiss.
Amy: Sonic. (Also see above.)
Eggman: BAH HUMBUG!