A single sycophant
One of these is like having a rat in your pocket it's annoying and it'll bite you when you least expect it.
My neighbor is one of these and he brags about his kid's grades every single day.
My teacher has one of these and she still thinks she's the best even though her class is full of failures.
My dad's co-worker is one of these and he's always trying to be my dad's friend.