In the rich text editor:
@Pikmin
In a comment:
[Pikmin](https://chowlings.com/user/Pikmin)
For Names and Avatars:
In the rich text editor:
%Pikmin
In a comment:
[![Pikmin's Avatar](https://chowlings.com/images/avatars/1012.png?v=1644063242)](https://chowlings.com/user/Pikmin) [Pikmin](https://chowlings.com/user/Pikmin)