Reader drawings - good dragons
Drawings of a good defect / a good dragon (exercise 9.4)
A nice dragon that doesn't bother anyone. User Interface (UI) dragon, just a difference to what was meant in design.
A new-born nameless dragon that doesn't yet know what it will be. It could become a good dragon!
Dragon eats spider in spaghetti code.
A nice dragon (or crocodile), really a feature, in any case not a bad defect.
A mad colleague can help in testing - a mad dragon.