Gravity on a round planet for character,Character not rotating towards planet surface

Hello, right now I am making a game where there is a planet instead on a flat surface. Because of this I need the player to rotate towards the planet, but it always messes up. I tried transform.lookat but the player just looked down. Then I rotated the player by 90 degrees so that it faces up but then I couldn't move them on the Y axis. Any help?