Character controller/gravity reverse/jump reverse/constantly running

Hello, i am basically trying to create a character controller that will have 3 mechanics to it that the player can control with touchscreen.

First thing is i need to make it so that the character controller can run continuously with a animation playing: for example like that game called impossible game in which the cube moves in one direction constantly.

Second thing i need is to make it so that at the push of button on the touchscreen the player can make the character switch from running on the ground to running on the roof.

Finally i need a jump touchscreen button so that when the player does start to run on the roof they can still jump, but instead of the player jumping up towards the roof they will be jumping down towards the ground.

Any and all assistance would be greatly appreciated i could really do with the help. thank you in advance