Shorter externsion variants for letters can be found at their lowercase equivalents. No extensions can be found at: A - @, C - o,  E - {, G - }, H - #, J - ], K - \, L - [, N - %, Q - ^, R - `, S - $, X - ~, and Y - |. An underscore can also be used to make the extensions longer.

When you want to make a color font but you're not a patron

By the way, "Kattakfa" is CTTACF (Closest Thing To A Color Font) said out loud.