Went back to the tumblr original image and it's tagged as: #livestream fun! #my art #captain america #steve rogers #superman #tony stark #ironman #obviously #bruce banner #mad scientist #he is adorbs #natasha romanoff #black widow #spiderman #duh #spideybros #clint barton #hawkeye #legolas #thor odinson #rapunzel #and the frying pan #i like the frying pan #i want one #halloween

So still not sure about Bruce, but I think Doctor Horrible could work!

LEGOLAAAAAAS! Tony did not know that when he said that he was actually complimenting Clint, not insulting him, which is why Clint then went on to help Tony *nods*.