If you prefer, you might comment on one of the important women leaders, e.g., Julia Maesa or Julia Mamea. You might also like looking at what Herodian has to say about Xenobia, the queen of Palmyra.
You may find the site linked here a bit difficult to navigate. Persevere! Use the "page" button at the top to navigate through the eight *books* of this history looking at the book heading to see which emperors are included in that book. Once you find the right book, click through each of the chapter links to find the material on the emperor you want to talk about.