Problem with character controller movement and gravity

I have a problem that I can not solve. I'm using .Move to make my character walk and every NPC present in the scene has its own gravity (I apply with my own logic).

My problem is that if I'm walking with my character towards an NPC, he'll walk over the NPC. The NPC will not block his passage as it normally would, he will walk over it and continue on his way.

I would not like to change the capsule collider because I believe there is another solution and I do not know if using SimpleMove would be good because I have my own gravity system.

Someone could give me a hand, I'm out of ideas.