vim not seeing many Unicode chars

[Tom Browder]

I'm running Debian Buster. Inside a terminal window I can use Emacs and can
see and enter Unicode chars.

But in the same terminal, when I run vim, I have trouble editing or seeing
most Unicode chars above ASCII.

I show the LANG env var set to 'en-US.UTF-8'. When I execute 'locale' I get:

    LANG=en-US.UTF-8
    LANGUAGE=
    LC_CTYPE="C"
    # all intermediate keys: LC_X="C"
    LC_ALL=C

My $HOME/.vimrc file is empty.

Note I am a minimalist vim user and use (and rember) very few vim commands.

I appreciate any help.

Best regards,

-Tom