Tiger & Bunny is getting so popular that the characters started making cameos in other series even before the series finished airing. Barnaby seems to pop up most often, though Kotetsu has been moonlighting on the side, too. There are probably more examples, and I am not sure which series some of these pictures are from. Feels kinda like “Spot Origami Cyclone” -game but instead of just T&B you’re playing it with all the current anime and manga.
And for lulz, the photoshopped version of the above.