Beat em up oldshool game character move

How to force the character to move not only in left and the right on a straight line and to top and a bottom, as in classical beat em up games. Such as Golben Axe, Streets of Rage, Battletoads. Please help.

You should use 3D not 2D.

Its all the same? The angle look is just by the way the graphics are designed.

Theres no difference for movement in that game as anything else in 3D. I can’t help you though as far as code, I’m a art guy.