You can add badges to your Nate Bot profile by running n!badges and buying a badge for that slot. Once you run the command, you will be given a Store of Badges. These range from Default Badges to Weekly Badges that are changed anytime.
Badges are completely cosmetic. Meaning that they are valuable (especially Weekly Ones!) and purely show how awesome you are!
If you want to buy a badge, first you need to run
n!badges, then you can run
n!badges buy <slot1-6>. The number represents the slot so you can have up to 6 badges!
Here is what the Badges Store looks like: