What character animation software should I use?

What character animation software should I use for creating very realistic animations compatible with Mecanim? It needs to be easy to learn, but the animations need to be fluid and realistic.
Thank you very much!

You should try 3dsmax or Maya. They are very animation friendly and lend themselves very well to animation of any style, be it cartoony or realistic. I’ve been an animator for 5 years now so I speak with experience. Good Luck !

If you don’t have Maya or 3dsmax there’s blender for free which is quite good and can do animations in if you don’t already have.