Board Thread:General Discussion/@comment-27907368-20160323193924/@comment-27620479-20160506060153

Also, that Chara has multiple personality disorder, where the original self is shy, and the second identity, named by the player, was created to cope with the problems that led to going to Mount Ebott and having self-abusive and suicidal tendencies. This is the creepy, destructive self that players evoke, and in the end meet, on a genocide route.

And I think the Temmie Armor is just made of cardboard, and only has good protection and a healing ability because of its sentimental value.