trolling
The act of intentionally outraging, inciting, antagonizing, or tormenting an individual, a group of people, or a general audience indiscriminately, through pranks, words, gestures, insults, or deeds. This has mostly online/internet connotations, but is also applicable to face-to-face and verbal mediums and circumstances.
The tag is definitely applicable to depictions of characters trolling other characters, probably to depictions of characters trolling (playfully or otherwise) the viewer, and possibly to images whose messages and depictions are intended (in part or as the sole motivation) to troll the viewer and/or cause outrage from many people online.