To tack onto this, can we pull a custom/Tav character back out of the chest and continue to play it, or is it lost forever and needs to be recreated by having said friend log in again?

My husband and I are playing with two custom characters each. We're just now getting to the point in the story that it will be a problem if we can't bring an NPC into our group, so this is really good timing. But I am afraid what happens when I put my second character in Wither's closet.. will I be able to pull her back out? We will test today and I will report back here, but I am super paranoid that something will go terribly wrong. Like, corrupting all my past save states so I can't get my other character back without having two friends log in to occupy the bodies again. We shall see!

[Linked Image from coloden.com]