[FairyKing]

I haven't developed this idea much, but inspired by Zenkaizer being the first trash hero, how about an entire team of them?
Ponkotsu Sentai Shūriger! (Piece-of-junk Sentai Repairing-ger)
I'm not sure what their actual theme would be. It could be a parody like Akibaranger where their suits, changers, mecha etc. are all made of garbage. On the opposite end of the silly-serious spectrum, it could also be set in a post-apocalyptic future and have them working to repair the world. Or it could be all about teaching kids to recycle?

Oh, or it could be something involving tsukumogami, maybe with each one partnered with a different haunted object, maybe even with those objects being their mecha! Although it's hard to imagine how you could combine a giant robot out of an umbrella, bottle, lantern, mirror and shamisen...