Promotional Powerless Piece Of Garbage has these relationships to other tropes:

parents kids shares a parent with:
Power Up Letdown
Revenue Enhancing Devices
parent child
Powerup LetdownUseless Useful Spell
Power Up LetdownBonus Feature Failure
''Awesome But Impractical
''Cool But Inefficient
''Scrappy Weapon
You'll need to Get Known if you want to add or modify these relationships.