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