If you run
$ python manage.py createsuperuser
Superuser creation skipped due to not running in a TTY. You can run manage.py createsuperuser in your project to create one manually.
from Git Bash and face the above error message try to append winpty i.e. for example:
$ winpty python manage.py createsuperuser Username (leave blank to use '...'):
To be able to run python commands as usual on windows as well what I normally do is appending an alias line to the ~/.profile file i.e.
MINGW64 ~$ cat ~/.profile
alias python='winpty python'
After doing so, either source the ~/.profile file or simply restart the terminal and the initial command python manage.py createsuperuser should work as expected!