In the issue, they say it's Thawne. But the design was clearly a kind of amalgam of both.
Thanks! Yeah, at first I was like "I guess I won't be changing anything about Robin and Batgirl!" but boy was I wrong.
Same pose he had in the original! Link to that's in the description.
Thanks, Greg! I kinda just do these as they feel fun to me, so who knows what'll be next?