Managed to get Roll20 to work on my WiiU. It is quite a bit limited, with no access to music, voice chat, or adding new images to the game field, but text chat and rolls still work, and you can still update the journal and edit what is already there. While it is not the ideal browser to use for the program, it worked for me in a pinch, and mostly limits the GM/DM, working well enough for players to use easily.
If you guys figure out any ways to maximize the experience on the WiiU, or would like to give feedback on how your playthrough was while running Roll20 on the browser, here's the place for it. ^-^
Btw, does anyone know of a way to get a keyboard to work on WiiU? I have gotten a usb keyboard to work on the Wii, but haven't tried it for this system yet.