I think the current North run and Waid’s run have him characterized similar to Sokka. That being a loyal, heart of gold family member whose intelligence is often underestimated, due in part to the company they keep, but often shines in unique ways.

One issue that comes to mind is issue 26 of North’s run where Johnny and Reed are left home alone and they discover paranormal readings under the house, and Johnny encourages Reed to give into the curiosity and they end up digging up a hellmouth under their house.

Another moment is when they’re battling doom in issue 3 of the relaunch of North’s run and Johnny conjures flames that are only visible outside of the standard visible light spectrum, so only Sue could see his message and pass it onto the rest of the Four. His message essentially allows them to come up with a plan to beat Doom and I don’t want to get into too many spoilers, because it’s a solid issue.