When I create a character bp derived from the same parent class as official default BP_ThirdPerson_Character with same settings, I place the character in level and move it, but it cannot play the walking/running animation, I cannot figure out the diff between them, could you tell me the points?
Alright, we might need more information here. It could be anything. Mind sharing with us some screenshots of what you have currently?
Also, double-check if the animations are playable for the inherited character skeletal mesh. On another side note, there might be some specific functionality that are not inheritable from the parent class.