QuinnyCoded is the OP of this thread. I’m guessing your client indicates this with the white box.

The person QuinnyCoded replied to (aeharding) is probably a mod (I’m guessing?), making their name show up blue in their client.

Update: I figured out that @aeharding@vger.social is the dev for Voyager, the lemmy client modeled after the Reddit app “Apollo”. So their name shows up kind of purple/blue in the Voyager app (which is my preferred client as well!).