It's kind of like an art trade but you draw two characters
The first one is yours, the second is of the person you're trading with
I'd be neat to do these again~ Last time I tried these on the deviantart forums no one responded cause the forums are deeeeead
Edit: here are some example to see what I mean ^^;
Here is a piece by: https://www.deviantart.com/cruelranch of her oc (on the right) and my oc (on the left)
And my part of her oc (left) and my oc (right):