What is your goal? Are you saying that you just want the character to be semi transparent? If that is the case then first change the blend mode to alpha blend. It’s under settings subpanel of the materials tab (right after the volume subpanel).
After that, change the surface shader back to principled bsdf and set the alpha option of that shader to something lower than 1 (like .5). If you need the object to bend light a little then set the transmission value to 1 and adjust the IOR value.
thanks for the info