Change character controller axis

Hi, I'm developing a 2D isometric game where every physics is computed in the x-y plane. I'd like to use a character controller to move my character, but since the movement occurs in x and y (not z), it's not working ok. When it's moved in the y axis, it doesn't slide on collision with something, it just don't move any more; but it slides ok when moving on the x axis. So, is there any way to make the character controller to move in the x-y plane? That is, like rotating the character controller 90 degrees in x axis (but character controller can not be rotated normally...)

Thank you for your time!