Making a fps fantasy with 2d charecters

How would i go about doing this this?
i want to make a game whare its 3d but with 2d charecters like in doom.

because i played warlock of firetop mountain on ds i i really want to make a game like that for my pc.

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Nothing tricky to it. Your characters are 2D sprites in 3D space. Do some research into billboard sprites. Good luck.

thanks