Hero Mode

Hero mode is a visual mode typically drawn by Andrew in order to emphasize a particularly epic moment in the story. Thus far we have only seen the hero mode for John, Future Dave, Rose and their guardians; however, it is assumed that all four kids have a hero mode style of some sort.

Art Style
Typically, hero mode is drawn in a style that does not display the traditional black outline and instead looks like a completely custom drawing instead of a previously drawn and re-used sprite. It also seems that the proportions of hero mode seem to be just a tad bit different from normal sprite mode (as shown by Rose's multiple hero modes). All in all creating a more dramatic effect for the readers. Sometimes the mode has been known to shine the colors of the character with the alternating colors in the background.