In the rich text editor:
@ThePaintedKitsune
In a comment:
[ThePaintedKitsune](https://www.worldofgaia.org/user/ThePaintedKitsune)
For Names and Avatars:
In the rich text editor:
%ThePaintedKitsune
In a comment:
[![ThePaintedKitsune's Avatar](https://www.worldofgaia.org/images/avatars/default.jpg)](https://www.worldofgaia.org/user/ThePaintedKitsune) [ThePaintedKitsune](https://www.worldofgaia.org/user/ThePaintedKitsune)