Ever wondered why there are no good and complete 2D Controllers on the asset store? No? Well, i did. But i don’t know the answer. But i don’t need it, because the Advanced 2D Controller has been submitted to the asset store.
With it, you can get your character to Walk, Sprint, Crouch, Jump and Double Jump.
With an easy to use inspector, you can simply drag and drop the script into your character, and you are good to go!
If you already have the animations as well, just use one of the two Mecanim examples avaible for you:
An advanced one, that allows for Idling, Walking, Sprinting, Crouching, Jumping and Double Jumping, as well as a
Simple one, that allows for Idling, Walking and Jumping.
The asset was submitted yesterday, so hopefully it will be avaible soon enough.
if you wanna check out a Demo Scene before purchasing the asset ($5), you can do so here:
http://advancedcontrollerdemo.esy.es/
Make sure to run in Edge or in Mozilla, since it’s Unity Web Player.
Space to Jump & Double Jump
Arrows to move
Left Shift so Sprint
Left Ctrl to Crouch
And also, you can check out the official release trailer here:
Looking forward for your feeback in this thread 
Please let me know if i should add something else, and maybe know if the pricing is right for the asset (first asset i ever made).
Also, just wanna let you all know that i am 12 years old, and this is hopefully a path that i can take to make a living of in the future.
-NoobStudios