Wario has a few secrets that many people do not know about. They might not be very helpful, but they are fun to use during gameplay.
Secrets:
Wario can eat items with his Chomp special move. If Wario eats an explosive, he will take on damage and be stunned.
Wario's special move, Wario Waft, charges up over time, and stays charged if Wairo dies.
Wario can perform taunts or wheelies while riding his motorcycle.

Wario can get ride a fallen bike, even if it isn't his.
Characters can pick up and throw Wario's bike. If the bike breaks after it is tossed, the pieces of the bike can be thrown.

Wario can eat his motorcycle.
Wario has 12 different costumes- 6 new cosutmes and 6 classic costumes.

Any idiot can face a crisis - it's day to day living that wears you out.
Anton Chekhov