walk on walls (third person)

Hi, As I say in the tittle I want to make a 3rd person character walk on walls and I've tried to change gravity just for the player character (aplying force to the rigidBody) but the result wasn't what I expect, the model ends in weird positions. I also tried to make it changing the transform on Collision enter like some people do to make his character climb a ladder or something like that but still not working. I need some advice.

examples: https://www.youtube.com/watch?v=nI_jSN_HBg4 https://www.youtube.com/watch?v=eYtfFqzPnb0 https://www.youtube.com/watch?v=soeKTEksWF4

change Physics.gravity isn't a solution because I want the rest of the objects fall normally even when the player is in a wall.

IMPORTANT: I just want to make my third person be able to walk on walls I DON'T want to change gravity in the scene.

Also I want the 3D model to stay as if the wall is the floor (so maybe I have to rotate the character too). https://www.youtube.com/watch?v=1ELTwaVNcCA