Nearly all 3D games operate on a free step style, as it makes for more realistic and fluid gameplay in a three dimensional environment. Even step works great in a two-dimensional environment, but in three dimensions, I think it would be maddeningly stiff.
I'd be interested to see how you tackle this in 2.5D. Will you be toggling walking/running motion to how hard you press the thumbstick, or are you going to have button combos like the classics? You're going to have to re-design everything from the ground up either way. Good luck.
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