wafer biscuit

The term given to a person that only has one trait to them; the trait of niceness. They're nice and that's it. Nothing more, nothing less, nothing special about them at all. They're just... nice. Like, y'know, Michael from down the road! You know Michael! He's... nice!

Hey remember -insert name here- from High school all those years ago?

Hardly, they were such a wafer biscuit.

Yeah they were nice and that's... that's about it.