That also reminds me how difficult it is to drag items to another person, unless I Just haven't found the simpler method yet.  Have to drag item, go up click arrow, drop item.   Repeat.  If wanting to move a ton of items at once..very slow and tedious. 
If you drag and drop something on a character portrait, it goes into their inventory.  You can't do multiple items at once unless you put them in a container first (e.g. a crate in your inventory) and then drop the container on your other character's portrait.