Sure it's possible, i've already a tutorial for this, but it's in german. (can't add link bcuz the board supports stuff that isn't allowed on gbatemp!)
In the end you need only a software to host the files in need and tethering (hotspot).
- Wifi File Transfer or Pro
- Ulti Server
- Bit Web Server
- Palapa Web Server
- Or another similar Software
PS: Disable mobile data before connecting your wii-u on your android device to prevent updates.
Yes, Wifi File Transfer can host too, simply open the full url to the starting index.html!
I personaly prefer Ulti Server becuz i can add as much services i want. FTP/SSH/Webserver...