Apparently I'm volatile, self-obsessed, and don't play well with others.
~ Iron Man.

Mischievous Heroes (also referred as Heroic Troublemakers) mean well, but sometimes cause trouble and play jokes on the hero or villain and act a little devious.

Mischievous characters are not meant to be taken too seriously; therefore, they cannot count as Pure Good. Even if in very rare cases, some Pure Good can pull pranks, they should go under the Tricksters category.