Board Thread:General Discussion/@comment-28885320-20160711182624/@comment-27524978-20160711192125

I believe it could be their "don't give up" personality that's usually hinted at.

Whichever way you think could be the case for their willpower, determination and bravery are main traits for many protagonists in video games because it keeps the plot going and makes the game playable. If Frisk just sat in a corner cowering the entire time, Undertale wouldn't be much of a fun experience now, would it?