Hi.
You are using a slightly inaccurate terminology.
``tty`` is a kernel subsystem that supports terminals.
Terminal could be
* hardware device connected to the serial port,
* virtual terminal -- so-called vty that runs on top of virtual console which is emulated by kernel using your videocard and keyboard,
* pseudo terminal backed by user-mode software (like xterm or sshd server)
I assume you are speaking about a "virtual terminal" that runs on console (either in text mode or in graphics mode using framebuffer).
Fonts are usually installed in ``/usr/share/consolefonts/``
You can install one with ``setfont(8)``.
Debian provides a package named ``console-setup`` that handles that.
Run ``dpkg-reconfigure console-setup`` to configure and read ``console-setup(5)``
Useful links: