Ah, here was the original alternate future Amy- She eventually aquired the nickname "War Amy Rose" to define which one I was refering to.

Her background is pretty long, but quick summary is she's a mercenary now... and more than a little mentally unstable. She also further trained her ability to summon her hammer- its now a vicious war maul- and she can summon up an armor out the same magical material. She's also sexually agressive, supremelly self confident to the point of arrogance, and has an explosive, violent temper- and on top of that, she's now monsterously strong and tougher than hell.

She's a riot to play. She's like and adorable, tiny, female Juggernaut.

Art by Mune