krol5326, check out the physics and bullet behaviors. Both have a gravity feature. Physics is performance heavy, but more realistic.
The bullet behavior has a set angle to motion feature, so you will be able to go up the incline with both feet on the ground, but you will lean back a bit.
Most likely you will need to create different graphics / animations to handle the different movements on inclines etc. Take it to the extreme of the incline being a wall. The character would most likely move differently up the wall than on a flat.
Hope that helps