Amy Rose in Sonic the Hedgehog 2

Further information :

Amy's abilities mirror those she utilized in the Sonic Advance series. She is slower than Sonic and can't use spin attacks, however has a number of abilities (mostly using her Piko Piko Hammer) to gain manueverability and access areas Sonic had difficulty reaching:

Hammer Attack: Press A and Amy swings her hammer, damaging enemies. In addition, Amy can use her hammer to smash obstacles such as walls and hit springs.
Hammer Jump: Press Down + A on the ground and Amy smashes the hammer into the ground, launching her into the air.
Hammer Whirl: Press Down + A in the air and Amy swirls down toward the ground. If an enemy is hit Amy will bounce up again.
Upward Dash: Hold Down + B/C while on the ground and Amy will rev her feet on the spot as opposed to a spin dash. Let go of Down to charge full throttle in the facing direction. Be careful though, Amy is vulnerable to blockading obstacles and enemies.