I learned how it is working. You set the name, then the portrait name on the description slot. Save it then apply normally. Next thing you have to set a new description while under disguise, use @description and @description add normally. Then you will have the name, the portrait and the description for it.
Example:
@disguise set name Malek
@disguise set description po_hu_458_
@disguise save 1
@disguise apply 1
@description Malek does not look suspicious at all.