Nah doesn't need to be wired connected at all unless you need to charge it while using it.
as far as your ratio issue goes, check out the following from Cyan, one of the moderators here
If it's the HBC ratio issue, you have few choices:
- run HBC -> launches in 4:3 -> Run Ratio fixer homebrew -> back to HBC in 16:9 -> Launch your homebrew
- Install the HBC forwarder from Joostin -> run the forwarder -> reloads HBC in 16:9 -> Launch your homebrew
- Install a forwarder for your homebrew which its TitleID doesn't start with E, F, J, L, M, N, P, Q and maybe X. (USBLoaderGX forwarder should be fine, it's starting with "U")
If it's not the HBC ratio issue, it might be a real USBLoaderGX issue (as reported by other users).
Force aspect ratio setting doesn't work correctly with some games (especially on vWii?)
I think it works fine with Wiiflow, you might want to use wiiflow to launch these problematic games.
from https://gbatemp.net/threads/wii-games-have-4-3-aspect-ration-on-vwii-on-wii-u.364703/
awesome thank you so much, i believe my HBC is not FUllscreen it is just almost fullscreen.
i noticed it just recently..