If asked, Po would say that 'preventing misdeeds by establishing a deterring reputation' is well within the jurisdiction of heroes. Since they are heroes, it's fine if they do it.

"Thank you! I wouldn't object to an actual badge, though. You'd look great with one too."

The rest of Aerich's words sent him in to a frenzy. Again. The panda bounced from one foot to the other.

"Wizards? Really? I've never met one before! Where is she? Can we go see her? I can't wait!"