Here is the blue print. I have turned off the spring arm or camera using the pawn control rotation. And the character will turn left/right to my mouse X move but not the character is not pitching to my mouse Y move. I assumed that the Controller will just pass everything to the character.
Just in case anyone else runs into this issue, the problem is that in your pawn settings, you can tick on whether Yaw/Pitch/Roll should be passed from Player Controller to Pawn. Only Yaw is ticked on default.