No, but if you want to see how to unlock every character and kart, I suggest you consult a walkthrough.
do every track in every grand prixx every class and you have them unlocked
you can type in this on google MARIO KART WII UNLOCKABLES to see a complete list of how to unlock everything.
If you unlocked every one though out the game sorry their are no one you can unlock.
you have to work throught the game and unlock courses look at cheats
You have to unlock every staff ghosts, unlock every characters, unlock every karts and bikes, unlock every cups in all of the engine classes, get all the cups at least one star or more, and also unlock mirror and win that engine class.
You must complete every Episode 7 in every stage. That is basically, All the Shadow Mario Stages.
To unlock Dry Bowser on Mario Kart you have to get a star rank on every 150cc cup to get a star rank what I did was beat every track on the cup and stay in first about 75% of the time Dry Bowser is hard to unlock but worth it
You start off with every character. There are no secret characters to unlock.
To unlock Mirror Mode, you have to place 1st on every cup in 150cc.
Get Super Mario Galaxy or Get a star on every race mirror mode if you do not have mirror mode unlock it
you can become a basketball player by practicing every day. you can also by signing up for basketball. if you are a basketball player you have to be at least from 1.54 to 2.10 of height .